Complex sentence: Battalions from the 1st Marine Division have been deploying to Afgahnistan regularly since 2008 however the Division Headquarters and staff were sent forward in March 2010 to take command of all Marine forces in the Helmand Province operating in support of Operation Enduring Freedom.
Split into simpler sentences: Battalions from the 1st Marine Division have been deploying to Afghanistan regularly since 2008. The division headquarters and staff were sent forward in March 2010 to take command of all Marine forces in the Helmand Province operating in support of Operation Enduring Freedom.