Complex sentence: The Duracell Bunny does not appear in North America, But used to, this is due to Energizer filing a trademark claim for the marketing use of a "battery bunny" in the United States and Canada.
Split into simpler sentences: The Duracell Bunny does not appear in North America, but used to. This is due to Energizer filing a trademark claim for the marketing use of a "battery bunny" in the United States and Canada.