choosing his roles with the precision of the insurance actuary 
(ROOT (S (VP (VBG choosing) (NP (PRP$ his) (NNS roles)) (PP (IN with) (NP (NP (DT the) (NN precision)) (PP (IN of) (NP (DT the) (NN insurance) (NN actuary))))))))
(ROOT (S (VP (VBG ) (NP (PRP$ ) (NNS )) (PP (IN ) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (NN ) (NN ))))))))