I hold Twain to be a much greater influence on Joyce than is generally appreciated.
I hold that Twain is a much greater influence on Joyce than is generally appreciated.
I hold Twain to be a much greater influence on Joyce than is generally appreciated.
I hold that Twain is a much greater influence on Joyce than is generally appreciated.
The verb "hold", as a cognitive verb (like "assert" or "maintain"), idiomatically takes a "that"-clause, never an infinitive.