Complex sentence: Each summer, several pyrotechnical companies from different countries present a 30-minute long pyromusical show, competing for the Gold, Silver and Bronze Jupiter trophies, which have become symbols of prestige within the fireworks industry.
Split into simpler sentences: Each summer, several pyrotechnical companies from different countries present a 30-minute long pyromusical show. The Jupiters have become symbols of prestige within the fireworks industry.