Complex sentence: The roller coaster design was first used in the 1970s, and as of 2007, seventeen Galaxi coasters are still in park-based operation, across the North American, European, and Australian continents, with another two Standing But Not Operating.
Split into simpler sentences: The roller coaster design was first used in the 1970s, and several examples are still in operation. As of 2007, seventeen Galaxi coasters are in park-based operation, across the North American, European, and Australian continents, with another two Standing But Not Operating.