Complex sentence: The discovery of gold in 1830 brought further development to Tomsk in the 19th century; however, when the Trans-Siberian Railway bypassed the city in favor of the village of Novonikolayevsk (now Novosibirsk), development began to move south to connect with the railway.
Split into simpler sentences: The discovery of gold in 1830 brought further development to Tomsk in the 19th century. However, when the Trans-Siberian Railway bypassed the city in favor of the village of Novonikolayevsk (now Novosibirsk), development began to move south to connect with the railway.