Complex sentence: Due to increasing concerns about the use of chess engines and outside communication, in 2014 FIDE banned all mobile phones from the playing area during chess competitions, under penalty of forfeiture of the game or even expulsion from the tournament.
Split into simpler sentences: Due to increasing concerns about the use of chess engines and outside communication, mobile phone usage is banned. In 2014 FIDE extended this to ban all mobile phones from the playing area during chess competitions, under penalty of forfeiture of the game or even expulsion from the tournament.