Complex sentence: Geologists have come to refer to the resulting lake as Lake Allison, named for Oregon State University geologist Ira S. Allison, who first described Willamette Silt soil in 1953 and noted its similarity to soils on the floor of former Lake Lewis in Eastern Washington.
Split into simpler sentences: Geologists have come to refer to the resulting lake as Lake Allison. It was named for Oregon State University geologist Ira S. Allison who first described Willamette Silt soil in 1953 and noted its similarity to soils on the floor of former Lake Lewis in Eastern Washington.