Complex sentence: According to Lewenhaupt's Lieutenant, Friedrich Christoph von Weihe, the Swedish losses in killed amounted to 2,000 men in the battle along with a number of captured, in total, Weihe estimates there was 3,800 Swedish casualties in the battle "and" following days.
Split into simpler sentences: According to Lewenhaupt's Lieutenant, Friedrich Christoph von Weihe, the Swedish losses in killed amounted to 2,000 men in the battle along with a number of captured. In total, Weihe estimates that there were 3,800 Swedish casualties in the battle "and" in the following days.