( ( of genome ) ( evolutions ( are ( studied ( by ( combining ( comparative genomics ) ) ) ) ) ) )
(ROOT (S (PP (IN of) (NP (NN genome))) (NP (NNS evolutions)) (VP (VBP are) (VP (VBN studied) (PP (IN by) (S (VP (VBG combining) (NP (JJ comparative) (NNS genomics)))))))))
of genome evolutions are studied by combining comparative genomics
(ROOT (S (NP (VBG Comparing) (NN genome) (NNS sequences)) (VP (VBZ provides) (NP (NNS clues)) (PP (TO to) (NP (NN evolution) (CC and) (NN development)))) (. .)))