Complex sentence: Since 1945, "the PPU has consistently condemned the violence, oppression and weapons of all belligerents"; it opposed the US intervention in Vietnam, the Soviet invasion of Afghanistan and condemned both the Argentinian invasion of the Falklands and the subsequent British retaliation.
Split into simpler sentences: Since 1945, "the PPU has consistently condemned the violence, oppression and weapons of all belligerents". The PPU also opposed the Soviet invasion of Afghanistan and condemned both the Argentinian invasion of the Falklands and the subsequent British retaliation.