( Here ( ( is ( an ( opportunity ( to ( ( observe ( the variations ) ) ( among ( ( a set ) ( of multiples ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (RB Here)) (VP (VBZ is) (NP (DT an) (NN opportunity) (S (VP (TO to) (VP (VB observe) (NP (DT the) (NNS variations)) (PP (IN among) (NP (NP (DT a) (NN set)) (PP (IN of) (NP (NNS multiples)))))))))) (. .)))
Here is an opportunity to observe the variations among a set of multiples.
(ROOT (S (NP (JJ Multiple) (NN fission)) (VP (VBZ is) (ADVP (RBR more) (RB often)) (VP (VBN observed) (PP (IN among) (NP (NNS protists))))) (. .)))