Maybe Einstein didn't say this!
From:
Calaprice, Alice. 2005. The New Quotable Einstein p.290. Princeton University Press, Princeton, NJ 08540.
Possibly or Probably by Einstein
"This quotation prompts the most quieries, since it is alleged to have appeared in Reader's Digest, in October 1977 ... Everyone seems to know it yet no one can find its original source ... It could be that someone long ago misattributed Occam's Razor to Einstein ... Or, the quotation may be a paraphrase of some of Einstein's other statements about simplicity".