Complex sentence: Meanwhile Abu Ubaida ibn al-Jarrah, the supreme commander of Muslim armies in Syria had ordered Shurhabil ibn Hasana to attack Bosra.The later laid siege of Bosra with his small army of 4000 men.
Split into simpler sentences: Meanwhile Abu Ubaida ibn al-Jarrah, the supreme commander of Muslim armies in Syria had ordered Shurhabil ibn Hasana to attack Bosra. The latter laid siege of Bosra with his small army of 4000 men.