Complex sentence: Robert John Jefferies (1 May 1968--26 May 2011) was an English cyclist, who was the bronze medalist at the British National Derny Champion in 1999, and also bronze medalist in the Keirin at the British National Track Championships in 1993.
Split into simpler sentences: Robert John Jefferies (1 May 1968--26 May 2011) was an English cyclist. He was the bronze medalist at the British National Derny Champion in 1999, and the bronze medalist in the Keirin at the British National Track Championships in 1993.