Complex sentence: Louise and Matt got engaged in December 2006, later marrying on the 4th September 2010 followed by the birth of their daughter Darcy on the 6th April 2011.
Split into simpler sentences: Louise and Matt became engaged in December 2006, marrying on the 4th September 2010. The birth of their daughter, Darcy, soon followed on the 6th April 2011.