( ( Explain ( that ( ( a lever ) ( is ( ( a type ) ( of ( simple machine ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Explain) (SBAR (IN that) (S (NP (DT a) (NN lever)) (VP (VBZ is) (NP (NP (DT a) (NN type)) (PP (IN of) (NP (JJ simple) (NN machine)))))))) (. .)))
Explain that a lever is a type of simple machine.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD six) (NNS types) (NNS types)) (PP (IN of) (NP (JJ simple) (NNS machines))))) (. .)))