Complex sentence: Demacia was one of the first cities to endorse the league of legends and with the biggest army in Valoran it joined with the intention of diminishing the threat of Noxus, another city league state that Demacia have a long and bitter feud with.
Split into simpler sentences: Demacia was one of the first cities to endorse the league of legends and with the biggest army in Valoran. It joined with the intention of diminishing the threat of Noxus, another city league state that Demacia has a long and bitter feud with.