Complex sentence: In two months, the British advanced, occupying the Italian province of Cyrenaica and destroying the 10th Army but the operation was halted in February 1941 to give priority to the Battle of Greece.
Split into simpler sentences: In two months, the British advanced, occupying the Italian province of Cyrenaica and destroying the 10th Army. However, the operation was halted in February 1941 to give priority to the Battle of Greece.