Complex sentence: He has been the announcer since the Yankees moved to their new ballpark in 2009, replacing Jim Hall, who replaced Bob Sheppard, who had been the Yankees announcer since 1951.
Split into simpler sentences: He has been the announcer since the Yankees moved to their new ballpark in 2009. Olden replaced Jim Hall, who replaced Bob Sheppard, who had been the Yankees announcer since 1951.