( Mutations ( ( are ( changes ( that ( happen ( to ( the ( DNA sequence ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (NNS Mutations)) (VP (VBP are) (NP (NP (NNS changes)) (SBAR (WHNP (WDT that)) (S (VP (VBP happen) (PP (TO to) (NP (DT the) (NNP DNA) (NN sequence)))))))) (. .)))
Mutations are changes that happen to the DNA sequence.
(ROOT (S (NP (NNS Mutations)) (VP (VP (VBP are) (NP (NP (NNS changes)) (PP (TO to) (NP (NP (DT an) (NN organism) (POS 's)) (NN dna))))) (CC and) (VP (VBP are) (NP (NP (DT an) (JJ important) (NN driver)) (PP (IN of) (NP (NP (NN diversity)) (PP (IN in) (NP (NNS populations)))))))) (. .)))