{HEAD ~ a variable valve timing mechanism} which variably controls {TAIL ~ the opening and closing timings} of the intake valve by changing a phase between a crankshaft of the internal combustion engine and an intake camshaft 
variably controls
{ HEAD ~ a variable valve timing mechanism } which variably controls { TAIL ~ the opening and closing timings } of the intake valve by changing a phase between a crankshaft of the internal combustion engine and an intake camshaft
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH