Complex sentence: In addition, he broke the one-game record of 22 straight completions set by Iowa's Chuck Long in 1984, and the final completion percentage in a single game mark, which broke the performance of 92.6% by UCLA's Rick Neuheisel in 1983.
Split into simpler sentences: In addition, he broke the one-game record of 22 straight completions set by Iowa's Chuck Long in 1984. Lastly, his 95.8% completion percentage broke the previous best single-game completion percentage of 92.6% set by UCLA's Rick Neuheisel in 1983.