Complex sentence: Those who support the Hanoi government, under the umbrella group Union Général des Vietnamiens de France (UGVF), is more organised and is recognised by the government of Vietnam.
Split into simpler sentences: Those who support the Hanoi government coalesce under the umbrella group Union Général des Vietnamiens de France (UGVF). UGVF is more organised and is recognised by the government of Vietnam.