Made sense of

Are these sentences correct:

1) He made sense of the scientific aspects of the book for me.

2) The scientific aspects of the book were made sense of by him.

3) The scientific aspects of the book, which were made sense of by him, were fascinating.

4) The scientific aspects of the book, which he stepped up to make sense of, were fascinating.

5) The scientific aspects of the book, which he stepped up to make sense of for me, were fascinating.

Gratefully,

Navi