Complex sentence: When Barbary pirates of North Africa sacked Vieste in 1554, they took an estimated 7,000 slaves, and the coast of Apulia was occupied at times by the Turks and at other times by the Venetians.
Split into simpler sentences: When Barbary pirates of North Africa sacked Vieste in 1554, they took an estimated 7,000 slaves. The coast of Apulia was occupied at times by the Turks and at other times by the Venetians.