Complex sentence: The role of the daughter Terry provided a major early breakthrough for Judi Dench in one of her first starring roles on television; she won the 1967 British Academy Television Award for Best Actress for her performance.
Split into simpler sentences: The role of the daughter Terry provided a major early breakthrough for Judi Dench in one of her first starring roles on television. Dench subsequently won the 1967 British Academy Television Award for Best Actress for her performance.