Complex sentence: The relationship between Achilles and Patroclus is a key element of the myths associated with the Trojan War, and has been the subject of some dispute in both the classical period and modern times.
Split into simpler sentences: The relationship between Achilles and Patroclus is a key element of the myths associated with the Trojan War. Its exact nature has been a subject of dispute in both the classical period and modern times.