Complex sentence: Soon after this she tells him that she doesn't want him to die, and so with her he finally visits his mother who he hasn't yet seen since his discharge, out of fear for her discovering her son to be a different man.
Split into simpler sentences: Soon after this she tells him that she doesn't want him to die, and so with her he finally visits his mother. He hasn't yet visited his mother since his discharge, out of fear that she will discover that he is a different man.