Complex sentence: Hill was the first National Leaguer to serve as a designated hitter in regular season play, doing so on June 12, in the first-ever game in interleague play as his San Francisco Giants faced the Texas Rangers at The Ballpark at Arlington.
Split into simpler sentences: Hill was the first National League player in regular season play ever to serve as a designated hitter. The distinction occurred on June 12, in the first-ever game in interleague play as his San Francisco Giants faced the Texas Rangers at The Ballpark at Arlington.