Complex sentence: Selman responded to many of the messages in the character of Homer, with the intent of answering them all, but he gave up when he received even more messages after deleting some of the answered ones in his inbox.
Split into simpler sentences: Selman responded to many of the messages in the character of Homer. He initially intended to answer them all, but gave up when he received even more messages after deleting some of the answered ones in his inbox.