Complex sentence: In Greek mythology, Assaracus was the second son of King Tros of Dardania which he inherited when his elder brother Ilus preferred to reign instead over his newly founded city of Ilium (which also became known as Troy).
Split into simpler sentences: In Greek mythology, Assaracus was the second son of King Tros of Dardania. He inherited the throne when his elder brother Ilus preferred to reign instead over his newly founded city of Ilium (which also became known as Troy).