Complex sentence: The tower was built of stone from the quarries of Penteli and Piraeus, making heavy use of material from the ancient buildings of the Acropolis, and was square in shape, long and wide, and its walls had a thickness of at their base.
Split into simpler sentences: The tower was built of stone from the quarries of Penteli and Piraeus, making heavy use of material from the ancient buildings of the Acropolis. It was square in shape, long and wide, and its walls had a thickness of at their base.