Complex sentence: However, Cendoya died unexpectedly, on 8 Jul 1673, while still governed Florida, and the Castillo de San Marcos still was being built and a huge storm destroyed the existing wooden fort in 1674.
Split into simpler sentences: However, Cendoya died unexpectedly, on 8 Jul 1673, while still governed Florida and the Castillo de San Marcos still was being built. In addition, a huge storm destroyed the existing wooden fort in 1674.