Complex sentence: Another homemade mixer is basically a trailer made from the rear end of a car, with the differential input pointed upward and a lawn mower blade attached to it, thus when the trailers wheel turn, the differential gears spin and power the blades.
Split into simpler sentences: Another homemade mixer is made from a trailer built from the rear end of a car, with the differential input pointed upward and a lawn mower blade attached. When the trailer's wheels turn, the differential gears spin and power the blades.