Complex sentence: He refused to honour the agreement, and Heracles killed him after completing the tasks and gave his kingdom to Augeas' son, Phyleus, who had been exiled for supporting Heracles against his father.
Split into simpler sentences: He refused to honour the agreement, and Heracles killed him after completing the tasks. Heracles gave his kingdom to Augeas' son, Phyleus, who had been exiled for supporting Heracles against his father.