Complex sentence: Between 1200 UTC September 14 and 0000 UTC September 15, visible satellite imagery of the vortex revealed a resemblance to a tropical cyclone, with an eye-like feature about 30 kilometers wide.
Split into simpler sentences: Between 1200 UTC September 14 and 0000 UTC September 15, visible satillite imagery of the vortex revealed that it had a resemblance of a tropical cyclone. The vortex had an eye-like feature about 30 kilometers wide.