Complex sentence: Amitabh Bachchan received his second National Film Award for Best Actor at the 53rd National Film Awards and his fourth Filmfare Award for Best Actor for his performance and Rani Mukerji won her second Filmfare Award for Best Actress.
Split into simpler sentences: Amitabh Bachchan received his second National Film Award for Best Actor at the 53rd National Film Awards for his performance. Bachchan won also his fourth Filmfare Award for Best Actor and Rani Mukerji won her second Filmfare Award for Best Actress.