Complex sentence: In April 637, Hashim led 12,000 troops from Ctesiphon to win a victory over the Persians at the Battle of Jalula, he then laid siege to Jalula for seven months.
Split into simpler sentences: In April 637, Hashim led 12,000 troops from Ctesiphon to win a victory over the Persians at the Battle of Jalula. He then laid siege to Jalula for seven months.