Complex sentence: The mine, whichh operates as Ok Tedi Mining Limited was formerly owned by a joint initiative between the PNG government, and Australian mining giant, BHP, but as of 2002, was restructured and The PNG Sustainable Development Program now owns the BHP share.
Split into simpler sentences: The mine, which operates as Ok Tedi Mining Limited was formerly owned by a joint initiative between the PNG government, and Australian mining giant, BHP. In 2002 the mine was restructured, and the PNG Sustainable Development Program now owns the BHP share.