Substitute "an innovation" (first line) with "it"; instead of: "considerable relative advantages" (second line), write: "relatively considerable advantages"; after "easily," (third line), rewrite the last 3 clauses (maybe they don't look like 3 clauses but they are) in this way: "is less complex than alternatives and outcomes are observable".

"An innovation is more likely to be adopted if consumers believe it has considerable relative advantages, like high compatiblility with existing values and systems, easy accesiblity, observable outcomes and simplicity.