Complex sentence: On 31 March 2009 Hilary Benn, Secretary of State for Environment, Food and Rural Affairs, announced his decision to confirm the designation of the South Downs National Park, which came into being exactly one year later and includes the town of Lewes within its boundaries.
Split into simpler sentences: On 31 March 2009 Hilary Benn, Secretary of State for Environment, Food and Rural Affairs announced his decision to confirm the designation of the South Downs National Park. The Park came into being exactly one year later and includes the town of Lewes within its boundaries.