Complex sentence: The first announcer was Jimmy Hodson, who served from the beginning of the current run in 1999 until 2011, when Hodson was replaced by Inger Tutor for one season (2011-2012).
Split into simpler sentences: The first announcer was Jimmy Hodson who was on from the beginning of the current run in 1999. In 2011, Hodson was replaced by Inger Tutor, for one season (2011-2012).