Complex sentence: In 1977 Gießen was merged with the neighboring city Wetzlar to form the new city of Lahn; however, this attempt to reorganize the administration was reversed in 1979.
Split into simpler sentences: In 1977 Gießen was merged with the neighbouring city Wetzlar to form the new city of Lahn. However, this attempt to reorganize the administration was reversed in 1979.