Complex sentence: By building a fixed city the Uyghurs created a protected storage space for trade goods from China; could hold a stable fixed court and receive traders and effectively cement their role as being central to Silk Road exchange.
Split into simpler sentences: By building a fixed city, the Uyghurs created a protected storage space for trade goods from China. They could hold a stable, fixed court, receive traders, and effectively cement their central role in Silk Road exchange.