Complex sentence: Tustin Legacy is planned community in Tustin, California being developed on the former Marine Corps Air Station Tustin which will include parks, a commercial retail center, and various densities of housing, for a total of 4,600 units.
Split into simpler sentences: Tustin Legacy is a planned community in Tustin, California being developed on the former Marine Corps Air Station Tustin. It will will include parks, a commercial retail center and various densities of housing, for a total of 4,600 units.