Simplify the following text for a Grade 12 native English-speaking person.
Original: Alexei Nikolayevich Kosygin ( , Aleksej NikolajeviÄ Kosygin ; 20 February 1904 â `` 18 December 1980 ) was a Soviet-Russian statesman during the Cold War .
Simplified: Alexei Nikolayevich Kosygin ( , Aleksej NikolajeviÄ Kosygin ; 21 February 1904 â `` 18 December 1980 ) was a Soviet-Russian man who was Premier of the Soviet Union .