Complex sentence: While leader and pole sitter Jeremy Mayfield was on the fourth lap heading into turn two, Ryan Newman (who already had a huge accident at the 2003 Daytona 500 in February) crashed into the Turn 1 wall and almost went upside down.
Split into simpler sentences: While leader and pole sitter Jeremy Mayfield was on the fourth lap heading into turn two. In turn one Ryan Newman, who already had a huge accident at the 2003 Daytona 500 in February, crashed into the wall and almost went upside down.