about a pair of squabbling working-class spouses 
(ROOT (PP (IN about) (NP (NP (DT a) (NN pair)) (PP (IN of) (NP (NN squabbling) (NML (NN working) (HYPH -) (NN class)) (NNS spouses))))))
(ROOT (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (NN ) (NML (NN ) (HYPH ) (NN )) (NNS ))))))