Complex sentence: Although the Soviet Union had detonated their RDS-6 around that same time, the RDS-6 was detonated via high powered explosives while Ivy Mike was detonated via radiation method.
Split into simpler sentences: Although the Soviet Union had detonated their RDS-6 around that same time as well. The RDS-6 was detonated via high powered explosives, while Mike was detonated via radiation method.