Complex sentence: Together they visited the Academies of Berlin, Dresden, and Paris; and after sojourns in Lübeck, Kiel, and Copenhagen, they finally settled at Hamburg in 1814, and became celebrated as portrait painters.
Split into simpler sentences: Together they visited the Academies of Berlin, Dresden, and Paris. After periods in Lübeck, Kiel, and Copenhagen, they finally settled at Hamburg in 1814, and became celebrated as portrait painters.