Complex sentence: The relationship ended during her UK tour of "Summer Holiday" when she began a relationship with Darren Day, and their son, Corey Mackenzie Day, was born in Kent in December 2004.
Split into simpler sentences: The relationship ended during her UK tour of "Summer Holiday" and she began a relationship with Darren Day. Their son, Corey Mackenzie Day, was born in Kent in December 2004.