Complex sentence: Thousands of children come over from the Southern California mainland to Catalina every year to study marine biology through hands-on programs including snorkeling, labs, boat rides, squid dissections and more.
Split into simpler sentences: Thousands of children travel from the Southern California mainland to Catalina every year to study marine biology. They participate in hands-on programs including snorkeling, labs, boat rides, squid dissections, and more.