Complex sentence: The complex consisted of six residential towers (with 2,000 apartments in total), three hotel towers (with 1,500 rooms) and two office towers along with an opera house, a conference complex, and a retail-leisure complex.
Split into simpler sentences: The complex consisted of six residential towers (with 2,000 apartments in total), three hotel towers (with 1,500 rooms) and two office towers. The development included an opera house, 2,000 units of residences and offices, 1,500 units of hotel rooms, a conference complex, retail-leisure complex.