Complex sentence: It was adapted by I.A.L. Diamond from a play by Samuel Taylor, and is probably one of the least famous movies of the tandem Wilder-Diamonds despite the fact that it is one of their best ones.
Split into simpler sentences: It was adapted by I.A.L. Diamond from a play by Samuel Taylor. It is probably one of the least famous movies of the tandem Wilder-Diamonds despite the fact that it is clearly one of their best ones.