Complex sentence: In 2005, the Karl Marx House museum was again closed for three months and was re-opened on June 9, the re-opening was attended by celebrities such as Anke Fuchs, Franz Müntefering, Kurt Beck, and Helmut Schröer.
Split into simpler sentences: In 2005, the Karl-Marx-House was again closed for three months. The museum was re-opened on June 9, the re-opening was attended by celebrities such as Anke Fuchs, Franz Müntefering, Kurt Beck, and Helmut Schröer.