Complex sentence: In September 1800 he was given command of a batallion of the Consular Guard and in 1803 he became colonel of the 10th Infantry regiment, which he lead in the campaigns of 1805 and 1806-1807, fighting at Austerlitz, Jena and Eylau.
Split into simpler sentences: In September 1800 he was given command of a batallion of the Consular Guard. In 1803 he became colonel of the 10th Infantry regiment, which he led in the campaigns of 1805 and 1806-1807, fighting at Austerlitz, Jena and Eylau.