He had an appetite and aptitude for business.
( He ( ( had ( ( an ( ( appetite and ) aptitude ) ) ( for business ) ) ) . ) )
(ROOT (S (NP (PRP He)) (VP (VBD had) (NP (NP (DT an) (NN appetite) (CC and) (NN aptitude)) (PP (IN for) (NP (NN business))))) (. .)))
In business, he found that he could excel; on top of this, he really enjoyed it.
( ( ( ( ( In business ) ( , ( he ( found ( that ( he ( could excel ) ) ) ) ) ) ) ; ) ( ( on ( top ( of this ) ) ) ( , ( he ( really ( enjoyed it ) ) ) ) ) ) . )
(ROOT (S (S (PP (IN In) (NP (NN business))) (, ,) (NP (PRP he)) (VP (VBD found) (SBAR (IN that) (S (NP (PRP he)) (VP (MD could) (VP (VB excel))))))) (: ;) (S (PP (IN on) (NP (NP (NN top)) (PP (IN of) (NP (DT this))))) (, ,) (NP (PRP he)) (ADVP (RB really)) (VP (VBD enjoyed) (NP (PRP it)))) (. .)))