Complex sentence: Photometry has also shown that the surface of Epsilon Eridani, like the Sun, is undergoing differential rotation, which means that the rotation period at the surface varies by latitude, the measured periods ranging from 10.8 to 12.3 days.
Split into simpler sentences: Photometry has also shown that the surface of Epsilon Eridani, like the Sun, is undergoing differential rotation. That is, the rotation period at the surface varies by latitude, with the measured periods ranging from 10.8 to 12.3 days.