Complex sentence: Helmuth Lehner is the first name of a heavy metal musician from Salzburg, Austria best known as the frontman, guitarist and a founding member of Austrian blackened death metal band Belphegor (originally Betrayer), where since late 2007 he has been the only original member.
Split into simpler sentences: Helmuth Lehner is the first name of a heavy metal musician from Salzburg, Austria. Helmuth is best known as the frontman, guitarist and a founding member of Austrian blackened death metal band Belphegor (originally Betrayer), where since late 2007 he has been the only original member.