Complex sentence: Some months after retiring the troops, the socialist Government agreed to increase the number of Spanish soldiers in Afghanistan and to send troops to Haiti to show the Spanish Government's willingness to spend resources on international missions of which it approved.
Split into simpler sentences: Some months after retiring the troops, the Socialist Government agreed to increase the number of Spanish soldiers in Afghanistan and to send troops to Haiti. It seems that one of the aims of these actions was to show the Spanish Government's willingness to spend resources on international missions of which it approved.