Complex sentence: Other changes made in 2007 were the introduction of a Most Entertaining Band competition and the mace-over-the-bar competition, both of which are light-hearted events allowing the bandsmen to let their hair down whilst entertaining the crowds.
Split into simpler sentences: Other changes made in 2007 were the introduction of a Most Entertaining Band competition and the mace-over-the-bar competition. Both of which were light-hearted events allowing the bandsmen to let their hair down whilst entertaining the crowds.