Complex sentence: In Scandinavia, Edel-Mega released the album's opening track, "Unspeakable", as the second single, but it's poor chart performance ended the promotion of the album prematurely.
Split into simpler sentences: In Scandinavia, Edel-Mega released the album's opening track, "Unspeakable", as the second single. But its poor chart performance ended the promotion of the album prematurely.