Complex sentence: When the issue of Archie raping Ronnie arises again, Peggy refuses to believe it but later learns that Ronnie is telling the truth and that Glenda knew but did not stop it.
Split into simpler sentences: When the issue of Archie raping Ronnie arises again, Peggy refuses to believe it. She later discovers that Ronnie is telling the truth and Glenda knew about the abuse but did nothing to stop it.