{HEAD ~ Both axes} of the gimbal have {TAIL ~ a combination} of auxiliary generator and motor with a locking mechanism 
have
{ HEAD ~ Both axes } of the gimbal have { TAIL ~ a combination } of auxiliary generator and motor with a locking mechanism
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH