Complex sentence: Mechanically, Horstmann shares much in common with the Christie suspension, which also uses a bell crank and horizontal spring, but in the Christie each wheel is mounted separately and the spring is normally mounted on or inside the tank hull.
Split into simpler sentences: Mechanically, Horstmann shares much in common with the Christie suspension, which also uses a bell crank and horizontal spring. The main difference is that in the Christie each wheel is mounted separately and the spring is usually mounted on or inside the tank hull.