Complex sentence: After Abelard's death, Bernard-having burned all of Abelard's heretical works, and thinking he has won the struggle with him-goes to Heloise to affect a reconciliation, but this also fails.
Split into simpler sentences: After Abelard's death, Bernard burns all of Abelard's heretical works and thus thinks he has won the struggle with him. He then goes to Heloise to affect a reconciliation, but this also fails.