Complex sentence: The team returned to the Regionalliga in 2004, spend one more season in the Oberliga in 2007--08 and then played in the Regionalliga Nord again until the Regionalliga Nordost was reestablished in 2012.
Split into simpler sentences: The team returned to the Regionalliga in 2004, spend one more season in the Oberliga in 2007--08 and the. Played in the Regionalliga Nord again until the Regionalliga Nordost was reestablished in 2012.