Complex sentence: After the defeat, Somerset and other Lancastrian leaders took refuge in Tewkesbury Abbey but they were forced from sanctuary two days later, tried and executed immediately, at the Cross in the centre of Tewkesbury.
Split into simpler sentences: After the defeat, Somerset and other Lancastrian leaders took refuge in Tewkesbury Abbey, but they were forced from sanctuary two days later. They were tried and executed immediately, at the Cross in the centre of Tewkesbury.