Complex sentence: The theater was built as a "second-run" movie theater, and boasted a seven hundred and twenty seat capacity, "washed air" cooling, and a marquee with over seven hundred and fifty feet of neon lighting.
Split into simpler sentences: The theater was built as a "second-run" movie theater and boasted a seating capacity of 720. It also had "washed air" cooling and a marquee with over 750 feet of neon lighting.