{HEAD ~ The invention} also is extendable to {TAIL ~ a sufficient length} to permit the user comfortably to tow the wheeled luggage across a supporting surface 
is extendable to
{ HEAD ~ The invention } also is extendable to { TAIL ~ a sufficient length } to permit the user comfortably to tow the wheeled luggage across a supporting surface
HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH