Complex sentence: The band's mainstream popularity was greatly revived by Metal Hammer for rating their debut album "Through the Darkness They March" 10/10, this led to tours with Bullet for My Valentine, Darkest Hour and Avenged Sevenfold.
Split into simpler sentences: The band's mainstream popularity was assisted by a 10/10 Metal Hammer review for their debut album "Through the Darkness They March". This led to tours with Bullet for My Valentine, Darkest Hour and Avenged Sevenfold.