Complex sentence: Buckle Folding is the more popular of the two methods, however, Knife Folding is sometimes preferable, for example, when the paper is thick, used as cross-fold or in cases when the paper has been stitched direct in the folding process (Faden Siegeln).
Split into simpler sentences: Buckle Folding is the more popular of the two methods, however, Knife Folding is sometimes preferable. An example of a time when knife folding is preferred is when the paper is thick, used as cross-fold or in cases when the paper has been stitched direct in the folding process (Faden Siegeln).