( Humans ( ( are ( closely ( related ( to ( ( a group ) ( of ( primates ( commonly ( called ( ( ( the apes ) , ) ( which ( includes ( chimpanzees ( , ( gorillas ( , ( ( orangutans and ) gibbons ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Humans)) (VP (VBP are) (ADJP (RB closely) (VBN related) (PP (TO to) (NP (NP (DT a) (NN group)) (PP (IN of) (NP (NP (NNS primates)) (VP (ADVP (RB commonly)) (VBN called) (NP (NP (DT the) (NNS apes)) (, ,) (SBAR (WHNP (WDT which)) (S (VP (VBZ includes) (NP (NNS chimpanzees) (, ,) (NNS gorillas) (, ,) (NNS orangutans) (CC and) (NNS gibbons))))))))))))) (. .)))
Humans are closely related to a group of primates commonly called the apes, which includes chimpanzees, gorillas, orangutans and gibbons.
(ROOT (S (NP (DT A) (-LRB- -LRB-) (NN n) (-RRB- -RRB-) (NN orangutan)) (ADVP (RB generally)) (VP (VBZ lives) (ADVP (RB alone))) (. .)))