Complex sentence: In October 1147 the Emperor Manuel I Comnenus (1143-80) sent an urgent request for help to Venice, and the Doge Pietro Polani called for all Venetians to help prepare a fleet to attack the Normans in the spring.
Split into simpler sentences: In October 1147 the Emperor Manuel I Comnenus (1143-80) sent an urgent request for help to Venice. The Doge Pietro Polani called for all Venetians to help prepare a fleet to attack the Normans in the spring.