Complex sentence: Decatur was careful to preserve "Macedonian", sending over a detail to help repair it, this taking a full 2 weeks, and he brought the captured ship into Newport, Rhode Island, on 4 December 1812, immediately causing a national sensation.
Split into simpler sentences: Decatur was careful to preserve "Macedonian", sending over a detail to help repair it. Decatur then brought the captured ship into Newport, Rhode Island, on 4 December 1812, which immediately caused a national sensation.