Complex sentence: Hera was angry with her husband Zeus because he had impregnated Leto but the island of Delos (or Ortygia in the Homeric Hymn to Artemis) disobeyed Hera and Leto gave birth there.
Split into simpler sentences: Hera was angry with her husband Zeus because he had impregnated Leto. But the island of Delos (or Ortygia in the Homeric Hymn to Artemis) disobeyed Hera, and Leto gave birth there.