Complex sentence: All Copenhagen varieties are packaged in a 1.2 oz wax coated cardboard or black plastic can with a metal lid, or if it is offered as tax-exempt for use outside the US, it is packaged in an all plastic can with no metal or cardboard.
Split into simpler sentences: All Copenhagen varieties are packaged in a 1.2 oz wax coated cardboard or black plastic can with a metal lid. Or if it is offered as Tax-Exempt for use outside the US, it is packaged in an all plastic can with no metal or cardboard.