( ( Simple ( and ( compound interest ) ) ) ( ( are studied ) . ) )
(ROOT (S (NP (NN Simple) (CC and) (NN compound) (NN interest)) (VP (VBP are) (VP (VBN studied))) (. .)))
Simple and compound interest are studied.
(ROOT (S (NP (NNS Scissors)) (VP (VBP are) (NP (JJ compound) (NNS machines))) (. .)))