Complex sentence: The reservoir was named "Ivanhoe" after the Scottish Sir Walter Scott 1819 novel Ivanhoe by land speculator and Gabrieliño Indians advocate Hugo Reid.
Split into simpler sentences: The reservoir was named "Ivanhoe" after the Scottish Sir Walter Scott 1819 novel Ivanhoe. One story about the origin of that name attributes it to land speculator and Gabrieliño Indians advocate Hugo Reid.