Complex Pulley Systems
Complex pulley systems include the block-and-tackle system, which contains two or more individual drums, with each of the drums having two or more wheels that rotate on the same axle.
Compound Pulley Systems
Compound pulley systems have both fixed and moveable pulleys, making the load feel a little lighter and enabling you to change the direction of the force.
This is a specialized pulley system that uses both the basics of a pulley system, but still adjusting for various mechanical changes.