Complex sentence: During the Late Classic period, Cotzumalhuapa was a major city that extended more than ten square kilometers, encompassing three major compounds, known as El Baul, Bilbao, and El Castillo, with extensive settlements between and around them.
Split into simpler sentences: During the Late Classic period, Cotzumalhuapa was a major city that extended more than. It encompassing three major compounds, known as El Baúl, Bilbao, and El Castillo, with extensive settlements between and around them.