Complex sentence: Originally there was no age restriction, but from 1991 it was restricted to artists under 50, and the award is accompanied by a prize of £25,000, although this has varied depending on the sponsor.
Split into simpler sentences: Originally there was no age restriction, but from 1991 it was restricted to artists under 50. The award is accompanied by a prize of £25,000, although this has varied depending on the sponsor.