Complex sentence: The of Mitsubishi, Mitsui, Sumitomo and Yasuda are the most significant "zaibatsu" groups, two of them, Mitui and Sumitomo having roots stemming from the Edo period while Mitubishi and Yasuda tracing their origin to the period during the Meiji Restoration.
Split into simpler sentences: The of Mitsubishi, Mitsui, Sumitomo and Yasuda are the most significant "zaibatsu" groups. Two of them, Mitsui and Sumitomo, have roots stemming from the Edo period while Mitsubishi and Yasuda trace their origins to the the Meiji Restoration.