Complex sentence: Drumlargan won the 1983 Whitbread Gold Cup which was described as "the most memorable win of my career" by O'Grady while in the same year Bit of a Skite proved victorious in the Irish Grand National.
Split into simpler sentences: Drumlargan won the 1983 Whitbread Gold Cup, which O'Grady described as "the most memorable win of my career". In the same year Bit of a Skite proved victorious in the Irish Grand National.