Complex sentence: On September 9, the remains of the unit were ordered to rest and completely refit with the new Tiger II's, with this change on September 22,1944, it was redesignated "Schwere SS-Panzer-Abteilung 501".
Split into simpler sentences: On September 9, the remains of the unit were ordered to rest and completely refit with the new Tiger IIs. With this change on September 22,1944, it was redesignated the "Schwere SS-Panzer-Abteilung 501".