Complex sentence: Malibu Boats' "Wedge" is a hydrofoil device that can be extended or retracted and when extended in creates downward force that pulls the stern of the boat lower in the water.
Split into simpler sentences: Malibu Boats' "Wedge" is a hydrofoil device that can be extended or retracted. When the "wedge" is extended in creates downward force that pulls the stern of the boat lower in the water.