Complex sentence: She retired from the Chinese entertainment scene in the late 1990s when Vivian and her long time partner, Joe Ngai, emigrated to Vancouver, Canada--although she still makes frequent trips to Hong Kong to visit her family and to support animal-rights charities.
Split into simpler sentences: She retired from the Chinese entertainment scene in the late 1990s when Vivian and her long time partner, Joe Ngai, emigrated to Vancouver, Canada. Though she still makes frequent trips to Hong Kong to visit her family and to support animal-rights charities.