1) he made his debut at krasnoyarsk opera house 2) he wan the bbc singer of the world competition in cardiff преобразовать из пассивного в активный залог

1) He made his debut at the Krasnoyarsk Opera House.(active) His debut was made at the Krasnoyarsk Opera House.(passive)2) He won the BBC Singer of the World competition in Cardiff.(active)
The BBC Singer of the World competitioin in Cardiff was won by him (passive)