Complex sentence: The second season premièred on February 23,2011, adding thirteen more OVAs to the series season 2 ended on July 20 with the release of OVAs 24,25, and 26.
Split into simpler sentences: The second season premiered on February 23,2011, adding thirteen more OVAs to the series. Season 2 ended on July 20,2011, with the release of OVAs 24,25, and 26.