Complex sentence: The Venetian commander of the fortress, Captain Andrea Pisani, brother of the Doge of Venice Alvise Giovanni Mocenigo, and 2000 others were killed in the explosion, one of the greatest catastrophes in the history of Corfu.
Split into simpler sentences: The Venetian commander of the fortress Captain Andrea Pisani brother of Venetian doge Alvise Giovanni Mocenigo, and 2000 others were killed in the explosion. The explosion caused one of the greatest catastrophes in the history of Corfu.