Complex sentence: The bit sequence "01111110" is commonly used as an FSS, thus a sequence of 6 consecutive 1s may not be present in the frame data as it may be confused for the FSS.
Split into simpler sentences: The bit sequence "01111110" is commonly used as an FSS. Therefore it is necessary to prevent a sequence of six consecutive 1s from occurring in the frame data as they may be confused for the FSS.