Complex sentence: The style was developed by Standard Oil of Ohio in 1916, and consisted of a small house-like building with an attached canopy which extended out, over the pumps to protect customers from the weather.
Split into simpler sentences: The style was developed by Standard Oil of Ohio in 1916, and consisted of a small house-like building with an attached canopy. The canopy extended out, over the pumps to protect customers from the weather.