explanations, and to corroborate findings.
( explanations ( , ( and ( ( to ( corroborate findings ) ) . ) ) ) )
(ROOT (FRAG (NP (NNS explanations)) (, ,) (CC and) (FRAG (X (TO to)) (NP (JJ corroborate) (NNS findings))) (. .)))
Corroborating findings is neccesary, there is no trusted source.
( ( ( Corroborating findings ) ( is neccesary ) ) ( , ( there ( ( is ( no ( trusted source ) ) ) . ) ) ) )
(ROOT (S (S (NP (VBG Corroborating) (NNS findings)) (VP (VBZ is) (ADJP (JJ neccesary)))) (, ,) (NP (EX there)) (VP (VBZ is) (NP (DT no) (VBN trusted) (NN source))) (. .)))