Complex sentence: The Bhoys from Seville was the nickname given to the Celtic team that participated in the 2002--03 UEFA Cup campaign which culminated in Celtic's defeat in the final after over 80,000 Celtic fans travelled to Seville in Spain to support their team.
Split into simpler sentences: The Bhoys from Seville was the nickname given to the Celtic team that participated in the club's 2002--03 UEFA Cup campaign. This culminated in Celtic's defeat in the final after over 80,000 Celtic fans travelled to Seville in Spain to support their team.