Complex sentence: Pat returned to the tour but then left it again in the winter of 2010; his son Lewis took over some of the day-to-day operations, and his brother James returned to work in ticketing.
Split into simpler sentences: Pat returned to the tour but then left it again in the winter of 2010. Pat's son Lewis took over some of the day-to-day operations, and his brother James returned to work in ticketing.