Complex sentence: Originally passengers continuing on had to take the steamboat up the lake to Kamloops and the Shuswap Country and the goldfields of the Big Bend of the Columbia River until a man named Savona started a ferry across the river at that location.
Split into simpler sentences: Originally passengers continuing on to the goldfields of the Big Bend of the Columbia River had to take the steamboat up the lake to Kamloops and the Shuswap Country. A man named Savona started a ferry across the river at that location.