Question

99 POINTS! Suggest any edits: Boo Radley helps the reader understand To Kill a Mockingbird greatly; he was portrayed as an unlikely hero after remaining a mystery for years, then miraculously saves Jem and Scout at the end of the book from the notorious Bob Ewell.

Answer 1

I would put a when before after remaining a mystery for years

Answer 2

The only edit I would recommend is removing the semicolon and adding a period. You'd then need to make the h in He a capital.