Complex sentence: In the summer of 219 BCE Sparta attacked Achaea from the South, Elis attacked from the west, and the Aetolians attacked from the north and by the end of the summer, Achaea was near collapse.
Split into simpler sentences: In the summer of 219 B.C.E. Sparta attacked Achaea from the South, Elis attacked from the west, and the Aetolians attacked from the north. By the end of the summer, Achaea was near collapse.