as an old pickup skidding completely out of control on a long patch of black ice 
(ROOT (PP (IN as) (NP (NP (DT an) (JJ old) (NN pickup)) (VP (VBG skidding) (PP (ADVP (RB completely)) (IN out) (PP (IN of) (NP (NN control)))) (PP (IN on) (NP (NP (DT a) (JJ long) (NN patch)) (PP (IN of) (NP (JJ black) (NN ice)))))))))
(ROOT (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (VP (VBG ) (PP (ADVP (RB )) (IN ) (PP (IN ) (NP (NN )))) (PP (IN ) (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (NP (JJ ) (NN )))))))))