of their time ( including mine ) on something very inconsequential 
(ROOT (PP (PP (IN of) (NP (NP (PRP$ their) (NN time)) (-LRB- -LRB-) (PP (VBG including) (NP (PRP mine))) (-RRB- -RRB-))) (PP (IN on) (NP (NP (NN something)) (ADJP (RB very) (JJ inconsequential))))))
(ROOT (PP (PP (IN ) (NP (NP (PRP$ ) (NN )) (-LRB- ) (PP (VBG ) (NP (PRP ))) (-RRB- ))) (PP (IN ) (NP (NP (NN )) (ADJP (RB ) (JJ ))))))