Complex sentence: However, he didn't make his debut for another 3 years, it came when he appeared as a second half substitute for Tony Hateley on 20 April 1968 in the 1--0 league defeat to West Ham United at Upton Park.
Split into simpler sentences: However, he didn't make his debut for another 3 years. It came when he appeared as a second half substitute for Tony Hateley on 20 April 1968 in the 1--0 league defeat to West Ham United at Upton Park.