Complex sentence: Venetian War (1463--79), but not the Second (1499-1503): following the Venetian defeat in the Battle of Modon in 1500, the 3,000-strong garrison surrendered, although it was well provisioned for a siege.
Split into simpler sentences: Venetian War (1463--79), but not the Second (1499-1503). Following the Venetian defeat in the Battle of Modon in 1500, the 3,000-strong fortress garrison surrendered, although it was well provisioned for a siege.