Complex sentence: In the final seconds of regulation of Game 7 of the Finals, L.A. Laker Frank Selvy missed an easy 10-footer that could've won the game, instead the game went into overtime in which the Celtics won the game and the series.
Split into simpler sentences: In the final seconds of regulation of Game 7 of the Finals, L.A. Laker Frank Selvy missed an easy 10-footer that would have won the game. Instead, the game went into overtime--the Celtics won the game and the series.