Complex sentence: John George II, Elector of Saxony, commissioned an opera house which was built from 1664 and opened in 1667, presenting "Il teseo" by Giovanni Andrea Moneglia.
Split into simpler sentences: John George II, Elector of Saxony, commissioned an opera house which was built from 1664 and opened in 1667. The first performance was "Il teseo" by Giovanni Andrea Moneglia.