That, too, was locked or bolted on the inside. 
( That ( , ( too ( , ( ( was ( ( ( locked or ) bolted ) ( on ( the inside ) ) ) ) . ) ) ) ) )
(ROOT (S (NP (DT That)) (, ,) (ADVP (RB too)) (, ,) (VP (VBD was) (VP (VBN locked) (CC or) (VBN bolted) (PP (IN on) (NP (DT the) (NN inside))))) (. .)))
It too was locked inside.
( It ( too ( ( was ( locked inside ) ) . ) ) )
(ROOT (S (NP (PRP It)) (ADVP (RB too)) (VP (VBD was) (VP (VBN locked) (ADVP (RB inside)))) (. .)))