Complex sentence: On 24 April 1135 a Pisan fleet with 8,000 reinforcements, captained by Robert of Capua, anchored in Naples and the duchy was the centre of the revolt against Roger II for the next two years.
Split into simpler sentences: On 24 April 1135, a Pisan fleet captained by Robert of Capua laid anchor in Naples carrying 8,000 reinforcements. Naples served as the centre of the revolt against Roger II for the next two years.