What? Okay, I really didn’t realize that it’s just one Russel.
I mean if you read the first paragraph and don’t have background in philosophy you would assume there were two persons named Russel after reading the first paragraph! I mean author says the first Russell was short lived and gives yearX-yearY. So yeah, I thought the first Russell died in yearY!!
There are no two Russells, it's the same person, just different kind of works in different periods of his life.