Complex sentence: It is currently owned by a partnership group headed by Geoff Molson and his brothers, Andrew and Justin, the same ownership group also owns the Montreal Canadiens and Evenko, an entertainment event promoter.
Split into simpler sentences: It is currently owned by a partnership group headed by Geoff Molson and his brothers, Andrew and Justin. The same ownership group also owns the Montreal Canadiens and Evenko, an entertainment event promoter.