Complex sentence: MOND was proposed by Mordehai Milgrom in 1983 as an alternative way to model the observed uniform velocity data, in contrast to the more widely accepted theory of dark matter.
Split into simpler sentences: MOND was proposed by Mordehai Milgrom in 1983 as a way to model this observed uniform velocity data. MOND stands in contrast to the more widely accepted theory of dark matter.