Complex sentence: Although his early film roles were partly the result of his good looks, by the latter half of the 1950s he became a strong screen presence with the range to act in numerous dramatic and comedy roles.
Split into simpler sentences: Although his early film roles were partly the result of his good looks, by the latter half of the 1950s he became a notable and strong screen presence. He began proving himself to be a fine dramatic actor, having the range to act in numerous dramatic and comedy roles.