Complex sentence: Most of the L&K-designed theaters were in the Art Deco or Streamline Moderne styles, including two built for Twin Cities theater proprietors Sidney and William Volk: the Camden (1938) and the Nile (1942).
Split into simpler sentences: Most of the L&K theaters were designed in the 1930s and'40s in the Art Deco or Streamline Moderne styles. Two of the firm's designs were commissioned by Twin Cities theater proprietors Sidney and William Volk: the Camden (1938) and the Nile (1942).