Complex sentence: The batter is prepared by mixing buckwheat flour and water to a thin consistency and sometimes a small amount of wheat flour or starch can be added to it because buckwheat itself has less glutinous elements.
Split into simpler sentences: The batter is prepared by mixing buckwheat flour and water to a thin consistency. Sometimes a small amount of wheat flour or starch can be added to it because buckwheat has less glutinous elements.