Complex sentence: Reaching the River Weser the 195th established their MDS at Petershagen, they did not remain here long with the speed of the divisions advance, they were soon at the River Elbe.
Split into simpler sentences: Reaching the River Weser, the 195th established their MDS at Petershagen; they did not remain there long. With the speed of the advance of the division, they were soon at the River Elbe.