Complex sentence: He was exiled and discredited for killing a blasphemer in a fit of rage with his sword and in his exile experienced a radical shift in tone that compelled him to lead a penitential life for others.
Split into simpler sentences: He was exiled and discredited for killing, with his sword in a fit of rage, a man he considered was a blasphemer. In his exile he experienced a radical shift in tone that compelled him to lead a penitential life for others.