Complex sentence: Therefore, the prevalent practice is to eat in the sukkah on Shemini Azeret outside of the Land of Israel, but not to recite the "berakhah" for sitting in a sukkah, as reciting it would "impinge" on the unique status of Shemini Atzeret.
Split into simpler sentences: Therefore, the prevalent practice is to eat in the sukkah on Shemini Azeret outside of Israel. However, one does not say the "berakhah" for sitting in a sukkah, as reciting it does "impinge" on the unique status of Shemini Atzeret.