Complex sentence: A pyrotechnician who dreams of making gigantic fireworks no one has ever seen or launched before, Seikichi Tamaya (玉屋 清吉 "Tamaya Seikichi") is very hot-tempered and will get flustered easily.
Split into simpler sentences: A pyrotechnician who dreams of making gigantic fireworks no one has ever seen or launched before. He is very hot-tempered and will get flustered easily.