Complex sentence: With the Confederacy's dwindling resources and military strength, the Confederate army was never in a position to retake the city, although periodic cavalry raids continued on Union supply lines in the general vicinity for some time.
Split into simpler sentences: With the Confederacy's dwindling resources and military strength, the Confederate army was never in a position to retake the city. Periodic cavalry raids continued on Union supply lines in the general vicinity for some time.