。
And then the other one drew a doubtful conclusion.
Literal
And then one-more [topic-は] doubtful conclusion [obj-を] put-out.
そして 'and then / and also' is the neutral narrative conjunction. 疑わしい 'doubtful / suspicious' is the adjective form of 疑う. 結論を出す (literally 'to put out a conclusion') is the set collocation for 'to draw / reach a conclusion,' a standard verb-noun pairing that learners should lock in. もう一つ 'one more / another' for parallel enumeration.