Complex sentence: In 1917, the Queensboro Corporation built the Greystones, the first garden apartments, followed by Linden Court in 1919--both the first co-op and the first with private parks--and then by Hampton Gardens, the Chateau, and the Towers in the 1920s.
Split into simpler sentences: In 1917, the Queensboro Corporation built the Greystones, the first garden apartments. The Hampton Gardens, the Chateau, and the Towers followed in the 1920s.