Complex sentence: According to tradition, Attica comprised twelve small communities during the reign of Cecrops, the legendary Ionian king of Attica, and these were later incorporated in an Athenian state during the reign of Theseus, the mythical king of Athens.
Split into simpler sentences: According to tradition, Attica comprised twelve small communities during the reign of Cecrops, the legendary Ionian king of Attica. These were said to have been later incorporated in an Athenian state during the reign of Theseus, the mythical king of Athens.