Complex sentence: In 1958, he wrote his first multi-million seller song, "Wings of A Dove", which was first recorded by Ferlin and has since been recorded by many artists and in many languages around the world.
Split into simpler sentences: In 1958, he wrote his first multi-million seller song, "Wings of A Dove", which was first recorded by Ferlin. It has since been recorded by many artists and in many languages around the world.