Complex sentence: The glider was tested with rockets for overloaded take offs, a rack of four 48 kilogram Rheinmetall 109-502 take off rockets mounted on the rear of the cargo compartment.
Split into simpler sentences: The glider was even tested with rockets for overloaded take offs. A rack of four 48 kilogram Rheinmetall 109-502 take off rockets was mounted on the rear of the cargo compartment.