Complex sentence: By early October 2013, the 13000 citizens of Moadhamiya, one of the places targeted in the August attack, had been surrounded by pro-government forces, and under siege for five months, severe malnourishment and medical emergencies become pressing, as all supply lines had stopped.
Split into simpler sentences: By early October 2013, the 13,000 residents of Moadhamiya, one of the places targeted in the August attack, had been surrounded by pro-government forces and under siege for five months. Severe malnourishment and medical emergencies become pressing as all supply lines had stopped.