Complex sentence: The Rock Out With Your Socks Out Tour is the first headlining concert tour by Australian band 5 Seconds of Summer, promoting the band's debut studio album, "5 Seconds of Summer (album)".
Split into simpler sentences: The Rock Out With Your Socks Out Tour is the first headlining concert tour by Australian band 5 Seconds of Summer. This promotes the band's debut studio album, "5 Seconds of Summer (album)".