There are three different ways of showing time here, which is confusing. One is horizontal distance. The leftmost branch is 1998, the rightmost is 2009. Also there’s vertical distance. Foodista was acquired early in 2009, Zappos most recently. And last there’s color, with a key at the bottom.
Also, I’m not sure what it means for the green line to branch like that. Is it just aesthetics or is there a meaning?