Complex sentence: The biggest festival held in Brno the fireworks festival Ignis Brunensis, this Latin name means "the Flame of Brno"; it's part of a festival with a bold name "Brno-City in the Centre of Europe".
Split into simpler sentences: The biggest festival held in Brno is the fireworks festival Ignis Brunensis (Latin for "Flame of Brno"). It is part of a festival with a bold name "Brno-City in the Centre of Europe".