Complex sentence: A team mathematical challenge is also held for schools who submit teams comprising 4 of their most able pupils from years 8 and 9 (ages 14 and below) who compete in regional heats before progressing to a national final.
Split into simpler sentences: A team mathematical challenge is also held for schools who submit teams comprising 4 of their most able pupils from years 8 and 9 (ages 14 and below). These students compete in regional heats before progressing to a national final.