Complex sentence: One of them is Katarina Lilja who has also done vocals for the new album and the other one has recently been announced by the band as being Lori Lewis, vocalist of "American" band Aesma Daeva.
Split into simpler sentences: One of them is Katarina Lilja who has also done vocals for the new album. The other one is Lori Lewis, vocalist of "American" band Aesma Daeva.