Complex sentence: Shortly after 12:00, the flotilla reached Bergen and anchored at Grimstadfjord, where the ships' crews painted over the Baltic camouflage with the standard "outboard grey" worn by German warships operating in the Atlantic.
Split into simpler sentences: Shortly after 12:00, the flotilla reached Bergen and anchored at Grimstadfjord. While there, the ships' crews painted over the Baltic camouflage with the standard "outboard grey" worn by German warships operating in the Atlantic.