Complex sentence: Carlsbad Skatepark was designed and built by inventors Jack Graham and John O'Malley and resided on the grounds of Carlsbad more extreme climates parks were built indoors, often of wood or metal.
Split into simpler sentences: Carlsbad Skatepark was designed and built by inventors Jack Graham and John O'Malley. In more extreme climates parks were built indoors, often of wood or metal.