Complex sentence: Petroliana is a category of Collectibles that are related to Gas Stations or the Petroleum Industry, including memorabilia such as Gas Pumps, Fuel Advertisments, and Road Maps.
Split into simpler sentences: Petroliana is a category of Collectibles that is related to Gas Stations or the Petroleum Industry. Petroliana memorabilia include items such as old Gas Pumps, Fuel Advertisments, and Road Maps.