Complex sentence: Miller is not a member of the Major League Baseball Players Union, as he was a replacement player because of the 1994 baseball strike was a 2002 National League All-Star for the Arizona Diamondbacks.
Split into simpler sentences: Miller is not a member of the Major League Baseball Players Union, as he was a replacement player because of the 1994 baseball strike. He was a 2002 National League All-Star for the Arizona Diamondbacks.