original: This work was accomplished through the efforts of Martin Evans and Oliver Smithies working on the knockout mice.
simplifications: This work was finished because of Martin Evans and Oliver Smithies working on the knockout mice. This work was done by Martin Evans and Oliver Smithies working on the knockout mice. Martin Evans and Oliver Smithies working on knockout mice paved the way for this accomplishment. Martin Evans and Oliver Smithies worked on the knockout mice. This was done by Martin Evans and Oliver Smithies working on the knockout mice. This work was done by Martin Evans and Oliver Smithies working on the knockout mice. This was accomplished by Martin Evans and Oliver Smithies working together on the knockout mice. Martin Evans and Oliver Smithies worked on the knockout mice to accomplish this function. This work was complete via the work of Martin Evans and Oliver Smithies working on the knockout mice. That first work was achieved thru the efforts of Martin Evans and Oliver Smithies to work on the knockout mice.