Complex sentence: Mdina experienced a period of decline over the following centuries, although it saw a brief revival in the early 18th century when it acquired several Baroque features, although it did not lose its medieval character.
Split into simpler sentences: Mdina experienced a period of decline over the following centuries, although it saw a revival in the early 18th century. At this point, it acquired several Baroque features, although it did not lose its medieval character.