Complex sentence: The half-pipe is a semi-circular ditch dug into the mountain or purpose built ramp made up of snow, with walls between 8 and competitors perform tricks while going from one side to the other and while in the air above the sides of the pipe.
Split into simpler sentences: The half-pipe is a semi-circular ditch dug into the mountain or purpose built ramp made up of snow, with walls between 8 and. Competitors perform tricks while going from one side to the other and while in the air above the sides of the pipe.