( ( That ( the geology ) ) ( ( was ( created ( by ( ( ( a ( collapsed caldera ) ) or ) 2 ) ) ) ) . ) )
(ROOT (S (NP (NP (DT That)) (NP (DT the) (NN geology))) (VP (VBD was) (VP (VBN created) (PP (IN by) (NP (NP (DT a) (JJ collapsed) (NN caldera)) (CC or) (NP (CD 2)))))) (. .)))
That the geology was created by a collapsed caldera or 2.
(ROOT (S (PP (IN After) (NP (DT a) (JJ massive) (NN eruption))) (, ,) (NP (NP (DT a) (NN mountain)) (VP (VBG collapsing) (PP (IN above) (NP (DT an) (JJ empty) (NN chamber))))) (VP (MD will) (VP (VB create) (NP (DT a) (NN caldera)))) (. .)))