Complex sentence: There are two phases--phase 1 is mostly residential with a few hotels and some stores, while phase 2 contains the largest all-inclusive resorts as well as the golf course and a significant number of residential properties.
Split into simpler sentences: There are two phases, phase 1 is mostly residential with a few hotels and some stores. Phase 2 contains the largest all inclusive resorts along with the golf course and a significant number of residential properties.