Complex sentence: There were three types of terrace agriculture, each one used for specific circumstances: hillslope contour terraces (steeper slopes), semi-terraces (gentle slopes, walls were made with Maguey plants rather than stones), and cross-channel terraces.
Split into simpler sentences: There were three types of terrace agriculture, each one used for specific circumstances. The three types were; hillslope contour terraces (steeper slopes), semi-terraces (gentle slopes, walls were made with Maguey plants rather than stones), and cross-channel terraces.