Complex sentence: Terry Corden brought his family into the fold, daughter Rachel and son Nathan were now both heavily involved in the running of the track and another event (the Produce Stakes taken from Hall Green Stadium) was brought to the track in 2009.
Split into simpler sentences: Terry Corden brought his daughter Rachel and son Nathan into the business and they are now both heavily involved in the running of the track. Another event (the Produce Stakes taken from Hall Green Stadium) came to the track in 2009.