Complex sentence: The Tongva occupied much of the Los Angeles basin and the Santa Catalina islands, San Nicolas, San Clemente and Santa Barbara; when Spanish explorer Juan Rodrigues Cabrillo arrived off the shores of Santa Catalina in 1542, he was met by the Tongva people.
Split into simpler sentences: The Tongva occupied much of the Los Angeles basin and the Santa Catalina islands, San Nicolas, San Clemente and Santa Barbara. When Spanish explorer Juan Rodrigues Cabrillo arrived off the shores of Santa Catalina in 1542, he was met there by the Tongva people.