Complex sentence: God sent Passover, the Angel of Death, to kill Avengelyne for her involvement, but the child, Magog, was born prior to the angel's arrival, and so together Passover and Avengelyne drove the demon-spawn away.
Split into simpler sentences: God sent Passover, the Angel of Death, to kill Avengelyne for her involvement. However the child, Magog, was born prior to the angel's arrival, and so together Passover and Avengelyne drove the demon-spawn away.