see the attraction for the sole reason that it was hot outside and there was air conditioning inside 
(ROOT (S (VP (VB see) (NP (DT the) (NN attraction)) (PP (IN for) (NP (DT the) (JJ sole) (NN reason) (SBAR (IN that) (S (S (NP (PRP it)) (VP (VBD was) (ADJP (JJ hot)) (ADVP (RB outside)))) (CC and) (S (NP (EX there)) (VP (VBD was) (NP (NN air) (NN conditioning)) (ADVP (RB inside)))))))))))
(ROOT (S (VP (VB ) (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN ) (SBAR (IN ) (S (S (NP (PRP )) (VP (VBD ) (ADJP (JJ )) (ADVP (RB )))) (CC ) (S (NP (EX )) (VP (VBD ) (NP (NN ) (NN )) (ADVP (RB )))))))))))