Complex sentence: Sigh's lead singer Miri Kawashima described the album as Mirai as a "thrash-metal-meets-German-symphonies" style which would sound different from the previous Sigh albums.
Split into simpler sentences: Sigh's lead singer Mirai Kawashima has described the style of the music as a "thrash-metal-meets-German-symphonies" style. This would sound different from the previous Sigh albums.