Connected to {TAIL ~ the light source chamber} 10 is {HEAD ~ a vacuum pump} 12; hence, the light source chamber 10 is a vacuum chamber 
Connected to is
Connected to { TAIL ~ the light source chamber } 10 is { HEAD ~ a vacuum pump } 12 ; hence , the light source chamber 10 is a vacuum chamber
REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH REL HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH