Complex sentence: On the northwest shore of Lake Cahuilla, remains of fish, shell middens and fishing weirs have been identified, indicating that early inhabitants of the region had relationships with Lake Cahuilla.
Split into simpler sentences: On the northwest shore of Lake Cahuilla, traces of human activity have been found. These include remains of fish, shell middens and fishing weirs, indicating that early inhabitants of the region had relationships with Lake Cahuilla.