{HEAD ~ Such an arrangement} would necessitate {TAIL ~ at least one fluid connection} at the seafloor, in addition to anchoring a vertical pipe to the base 
necessitate
{ HEAD ~ Such an arrangement } would necessitate { TAIL ~ at least one fluid connection } at the seafloor , in addition to anchoring a vertical pipe to the base
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH