Complex sentence: Unimpressed by the performance during further tropical trials BOAC did not in the end operate the Tudor 2 and only three production Tudor 2s were built, but six were built for British South American Airways as the Tudor 5.
Split into simpler sentences: Unimpressed by the type's performance during further tropical trials, BOAC did not operate the Tudor 2 and only three production Tudor 2s were built. Six aircraft were built for British South American Airways as the Tudor 5.