Complex sentence: On 22 December 2011, a series of coordinated car bombings and IED attacks struck over a dozen neighborhoods across Baghdad, killing at least 63 people and wounding 180; the assault came just days after the US completed its troop withdrawal from the country.
Split into simpler sentences: On 22 December 2011, a series of coordinated car bombings and IED attacks struck over a dozen neighborhoods across Baghdad, killing at least 63 people and wounding 180. The assault came just days after the US completed its troop withdrawal from the country.