Complex sentence: As with all Group 5 cars, the Celica received extensive modifications to the bodywork which was re-styled and built from lightweight GFRP (glass fiber-reinforced plastic), only the hood, roof, doors and rail panel were retained from the stock model.
Split into simpler sentences: As with all Group 5 cars, the Celica received extensive modifications to the bodywork, which was re-styled and built from lightweight glass fiber-reinforced plastic (GFRP). Oonly the hood, roof, doors and rail panel were retained from the stock model.