Complex sentence: In early January 1923, the rebels had taken an offensive over Tropojë, later over all Has District, had surrounded Krumë (center of the Prefecture of Kosovo), attacked the gendarme stations in Nikaj-Mërtur and arrived by the Drin river.
Split into simpler sentences: In early January 1923, the rebels had taken an offensive over Tropojë, followed by a broader one on Has District. They had surrounded Krumë (center of the Prefecture of Kosovo), attacked the gendarme stations in Nikaj-Mërtur and arrived by the Drin river.