( There ( ( are ( ( three types ) ( of ( galaxies ( let ( s ( talk ( about ( ( each type ) ( in turn ) ) ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS types)) (PP (IN of) (NP (NP (NNS galaxies)) (SBAR (S (VP (VBD let) (SBAR (S (NP (PRP s)) (VP (VBP talk) (PP (IN about) (NP (NP (DT each) (NN type)) (PP (IN in) (NP (NN turn))))))))))))))) (. .)))
There are three types of galaxies let s talk about each type in turn.
(ROOT (S (NP (EX There)) (VP (VBP are) (NP (NP (CD three) (NNS types)) (PP (IN of) (NP (NNS galaxies))))) (. .)))