In addition, the design must take into careful consideration the overall headroom for meeting system demands during such instances, and thus {HEAD ~ varying loads} require {TAIL ~ more design complexity} 
require
In addition , the design must take into careful consideration the overall headroom for meeting system demands during such instances , and thus { HEAD ~ varying loads } require { TAIL ~ more design complexity }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL