Complex sentence: Windsor Hills underwent development in the late 1930s by the Marlow-Burns Company; aimed at the high upper class neighborhood akin to the style of Bel-Air and Beverly Glen.
Split into simpler sentences: Windsor Hills underwent development in the late 1930s. It was developed by Marlow-Burns Devlopment Company; aimed at the high upper class neighborhood akin to the style of Bel-Air and Beverly Glen.