Complex sentence: While the stand-up roller coaster has been popular with guests of amusement parks for its unusual riding position, a common complaint of riders is leg discomfort, due to the challenge of straddling the seat with the feet flat on the floor.
Split into simpler sentences: While the stand-up roller coaster has been popular with guests of amusement parks for its unusual riding position. A common complaint of riders is leg discomfort, due to the challenge of straddling the seat with the feet flat on the floor.