( ( Of course ) ( ( ( the ( ( most important ) part ) ) ( of ( ( the anatomy ) ( that ( controls ( erections ( , ( ( orgasms and ) ejaculations ) ) ) ) ) ) ) ) ( ( is ( the brain ) ) . ) ) )
(ROOT (S (PP (IN Of) (NP (NN course))) (NP (NP (DT the) (ADJP (RBS most) (JJ important)) (NN part)) (PP (IN of) (NP (NP (DT the) (NN anatomy)) (SBAR (WHNP (WDT that)) (S (VP (VBZ controls) (NP (NNS erections) (, ,) (NNS orgasms) (CC and) (NNS ejaculations)))))))) (VP (VBZ is) (NP (DT the) (NN brain))) (. .)))
Of course the most important part of the anatomy that controls erections, orgasms and ejaculations is the brain.
(ROOT (S (ADVP (RB Not) (RB surprisingly)) (, ,) (NP (JJ controlling) (NN flight)) (VP (VBZ is) (NP (NP (DT the) (NN function)) (PP (IN of) (NP (NP (DT the) (ADJP (RBS most) (JJ developed)) (NN part)) (PP (IN of) (NP (NP (DT a) (NN bird) (POS 's)) (NN brain))))))) (. .)))