Complex sentence: They had a composite body built on the 75 platform, to which several changes had been made: coaxial coil springs and dampers with hydraulic lifters were employed on both axles, replacing the torsion bars at the front and the separate springs/dampers at the rear.
Split into simpler sentences: They had a composite body built on the 75 platform, to which several changes had been made. Coaxial coil springs and dampers with hydraulic lifters were employed on both axles, replacing the torsion bars at the front and the separate springs/dampers at the rear.