Complex sentence: About 560 BC, Ephesus was conquered by the Lydians under king Croesus, who, though a harsh ruler, treated the inhabitants with respect and even became the main contributor to the reconstruction of the temple of Artemis.
Split into simpler sentences: About 560 BC, Ephesus was conquered by the Lydians under king Croesus. He treated the inhabitants with respect, despite ruling harshly, and even became the main contributor to the reconstruction of the temple of Artemis.