How would you say first sentence?

Would you say "different ranked singers " how would you explain what I've written in the following sentences in one sentence?

There are different ranked singers in Korean girls bands. There are lead singers, backup singers and 3rd string singers. There are also chorus singers.

How would you write

How would you explain what I've written in the last 2 sentences in one sentence?

"How would you explain what I've written in sentence 2 without writing sentence 2"

Thanks very much