Complex sentence: Environmental vegans focus on conservation rather than animal rights: they reject the use of animal products on the premise that practices such as farming--particularly factory farming--fishing, hunting and trapping are environmentally unsustainable.
Split into simpler sentences: Environmental vegans focus on conservation rather than animal rights. They reject the use of animal products on the premise that practices such as farming--particularly factory farming--fishing, hunting and trapping are environmentally unsustainable.