Complex sentence: It is the first of three Grade 1 juvenile hurdle races to be run in the British jump racing season, followed by the Triumph Hurdle and the Anniversary 4-Y-O Novices' Hurdle.
Split into simpler sentences: It is the first of three Grade 1 Juvenile Hurdle races to be run in the British jump racing season. The other two are the Triumph Hurdle and the Anniversary 4-Y-O Novices' Hurdle.