Complex sentence: In the town's early years, manufactured goods were brought overland by wagons or along the White River by keelboats and flatboats, but much of the local produce was not exported to markets outside of Indianapolis until railroads began passing through in the city in the 1850s.
Split into simpler sentences: In the town's early years, manufactured goods were brought overland by wagons or along the White River by keelboats and flatboats. Much of the local produce was not exported to markets outside of Indianapolis until the railroads established transportation routes in the 1850s.