Complex sentence: However at his funeral many Nationalist Afrikaners believed the rumour that it was a government assassination and this added fuel to the fire, that was further enflamed by Siener van Rensburg and his prophecies.
Split into simpler sentences: However at his funeral many Nationalist Afrikaners believed the rumour that it was a government assassination and this added fuel to the fire. Which was further enflamed by Siener van Rensburg and his prophecies.