Complex sentence: The White Patriot Party was an American anti-Semitic white supremacist organization which, on April 6,1987, declared war against the "Zionist Occupation Government" (ZOG).
Split into simpler sentences: The White Patriot Party was an American anti-Semitic white supremacist organization. On April 6,1987, the group declared war against the "Zionist Occupation Government" (ZOG).