Oahu is the third largest of the Hawaiian Islands, formed by two volcanoes roughly four to six million years ago creating approximately 600 square miles of land.
(Oahu; is; the third largest of the Hawaiian Islands) (the Hawaiian Islands; formed; by two volcanoes roughly four to six million years ago) (two volcanoes roughly four to six million years ago; creating; approximately 600 square miles of land)
Oahu the Hawaiian Islands two volcanoes roughly four to six million years ago
is formed creating
the third largest of the Hawaiian Islands
by two volcanoes roughly four to six million years ago
approximately 600 square miles of land