Compound-complex Sentences

Respected Sir,

I stumbled on a book, Words on Words: A Dictionary for Writers and Others who Care about Words by the late John Brenner ( https://www.amazon.com/Words-John-B-Bremner/dp/0231044933 )

In a section of his book, he classifies five types of the sentences (the four we know): simple, compound, complex, compound-complex, and complex-complex sentence. I am happy to say that I now own a copy of the book, Words on Words written by the late John B. Bremner, I love his entry on sentences that I have decided to put the whole thing(including complex-complex sentence) here and see what you think of it.

Sentences
A sentence is a grammatical unit that conveys a complete thought and contains a subject and a predicate, either or both of which may be understated but understood. Sentences are principally classified as simple,
compound, complex, compound-complex, complex-complex. Thus: -A simple sentence consists of one independent clause: \"He knows almost nothing.\"

A compound sentence consists of two or more independent clauses connected by a coordinating conjunction: \"He knows almost nothing and he doesn\'t want to study.\" and \"He knows almost nothing and he doesn\'t want to study but he may change.\"

A complex sentence consists of an independent clause and one or more dependent clauses: \"He knows almost nothing because he refuses to study.\" and \"Because he refuses to study, he doesn\'t know he should.\"

A compound-complex sentence consists of two or independent clauses and one or more dependent clauses: \"He knows that he should study but he doesn\'t want to.\" and \"He knows that he should study but he doesn\'t think that he has a chance of passing.\"

A complex-complex sentence consists of an independent clause and a dependent clause that is subordinate to another dependent clause: \"He got mad when I told him that he should study.\"

Before I had this book in my possession, I attempted to create a complex-complex sentence and here is what I came up with: \"Now, the popular kids were pursuing those that once pursued them that they had rejected in
the past.\"

I ran this sentence by Nancy Sullivan, who is the author of Essential Grammar, who said that the second
dependent clause of my sentence \"that they had rejected in the past\" was awkward. She created her own version: \"Now, the boy was buying cars that needed parts that were difficult to find.\"

I want to know what you think of this and is it possible for to create your own complex-complex sentence based on your understanding of it?

What about variations of a complex-complex sentence?:
Independent clause with multiple dependent clauses subordinate to another dependent clause
Independent clause with dependent clause subordinate to other multiple dependent clauses
Independent clause with multiple dependent clauses subordinate to their own dependent clause
Independent clause with multiple dependent clauses subordinate to their own dependent clauses

Let me know what you think. I would love to hear what have to say about it.

Thank you,

Nancy Pal
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