Complex sentence: A cyclone aloft cut off from the main band of the Westerlies, it spurred cyclogenesis in the Florida Straits by November 22, which led to a nor'easter at an unusually southern latitude near the Bahamas.
Split into simpler sentences: A cyclone aloft cut off from the main band of the Westerlies. It spurred cyclogenesis in the Florida Straits by November 22, which led to a nor'easter at an unusually southern latitude near the Bahamas.