people who are enthusiastic about something and then 
(ROOT (S (NP (NP (NNS people)) (SBAR (WHNP (WP who)) (S (VP (VBP are) (ADJP (JJ enthusiastic) (PP (IN about) (NP (NN something)))))))) (CC and) (ADVP (RB then))))
(ROOT (S (NP (NP (NNS )) (SBAR (WHNP (WP )) (S (VP (VBP ) (ADJP (JJ ) (PP (IN ) (NP (NN )))))))) (CC ) (ADVP (RB ))))