Complex sentence: Rotating Michelson's experimental apparatus does not affect the diffraction pattern which represents the negative result of Michelson's experiment; if the ether existed, the different angles, of the experimental apparatus should affect the interference pattern yet the interference pattern is unaffected.
Split into simpler sentences: Rotating Michelson's experimental apparatus does not affect the diffraction pattern which represents the negative result of Michelson's experiment. If the ether existed, the different angles, of the experimental apparatus should affect the interference pattern yet the interference pattern is unaffected.