The separation of three ideas from the given sentences would be as follows:
- Some researchers share Marley's concern.
- Thier studies suggest young people gain self-esteem from some books.
- These books feature positive and realistic character of the readers' ethnicity.
- The three separate ideas that have been presented in the given sentence would be as mentioned above.
- The first idea is regarding certain researchers who have opted to share the issue raised by Marley.
- The next idea talks about the studies of these researchers who have shown that certain books cause young people to develop self-esteem.
- The last idea is associated with the positive and true-to-life representation in these books about the backgrounds of the readers.
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