( ( Leaving ( ( no support ) ( for ( this ( massive dome ) ) ) ) ) ( , ( ( ( the roof ) ( of ( the ( magma chamber ) ) ) ) ( ( ( collapsed , ) ( forming ( ( the ( bowl-shape depression ) ) ( known ( as ( a caldera ) ) ) ) ) ) . ) ) ) )
(ROOT (S (S (VP (VBG Leaving) (NP (NP (DT no) (NN support)) (PP (IN for) (NP (DT this) (JJ massive) (NN dome)))))) (, ,) (NP (NP (DT the) (NN roof)) (PP (IN of) (NP (DT the) (NN magma) (NN chamber)))) (VP (VBD collapsed) (, ,) (S (VP (VBG forming) (NP (NP (DT the) (JJ bowl-shape) (NN depression)) (VP (VBN known) (PP (IN as) (NP (DT a) (NN caldera)))))))) (. .)))
Leaving no support for this massive dome, the roof of the magma chamber collapsed, forming the bowl-shape depression known as a caldera .
(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)))) (. .)))