Complex sentence: Captain Russell backpedals and catches the ball, gleefully believing that the British team has won, until he realises that he had actually caught the ball beyond the boundary which gives 6 runs, and the win, to Bhuvan's team.
Split into simpler sentences: Captain Russell backpedals and catches the ball, leading him to believe the British team has won. However, Russell caught the ball beyond the boundary which gives 6 runs, and the win, to Bhuvan's team.