Complex sentence: The abundance of lake sturgeon made the area around Niles famous in the mid-to late-1800s and fish up to 12 feet long and three hundred pounds were taken by anglers, and their roe was exported to Russia as caviar.
Split into simpler sentences: The abundance of lake sturgeon made the area around Niles famous in the mid-to late-1800s. Fish up to long and were taken by anglers, and their roe was exported to Russia as caviar.