尾形氏と話をするのに、ケンは適任だと思います。ただし、プレゼンテーション資料を準備すればの話です。

、。、。

I think Ken is the right person to talk to Mr. Ogata — provided he prepares the presentation materials.

Literal

Ogata [with-と] talking [for-のに] Ken [topic-は] suitable [quotative-と] think [polite-ます]. However presentation materials [object-を] preparing [conditional-ば] [possessive-の] story [copula-です].

適任だと思います gives the recommendation. ただし introduces a condition — 'however, on the condition that.' プレゼンテーション資料を準備すればの話です means 'that's assuming he prepares the materials.' A business-context conditional recommendation.