Complex sentence: Trim levels were originally Pony, LX, and GT: the GT was the North American equivalent of the Laser XR3i version, featuring a 1.8 L Mazda DOHC engine.
Split into simpler sentences: Trim levels were originally Pony, LX, and GT. The GT was the North American equivalent of the Laser XR3i version, featuring a 1.8 L Mazda DOHC engine.