Complex sentence: Vitalik Buterin (Russian language Виталик Бутерин) is a Russian programmer and writer primarily known as a co-founder of Ethereum and as a co-founder of Bitcoin Magazine.
Split into simpler sentences: Vitalik Buterin (Russian language Виталик Бутерин) is a programmer and writer. He is primarily known as a co-founder of Ethereum, and as a co-founder of Bitcoin Magazine.