with flashes of warmth and gentle humor 
(ROOT (PP (IN with) (NP (NP (NNS flashes)) (PP (IN of) (NP (NP (NN warmth)) (CC and) (NP (JJ gentle) (NN humor)))))))
(ROOT (PP (IN ) (NP (NP (NNS )) (PP (IN ) (NP (NP (NN )) (CC ) (NP (JJ ) (NN )))))))