Complex sentence: By April 2012, he was recognized as the highest-rated bullet player on Chess.com and subsequently qualified for and accepted Chess.com's Death-Match 4 against then-IM Conrad Holt, who had the highest-rated blitz rating.
Split into simpler sentences: By April 2012, he was recognized as the highest-rated bullet player on Chess.com. He subsequently qualified for and accepted Chess.com's Death-Match 4 against then-IM Conrad Holt, who had the highest-rated blitz rating.