Complex sentence: IEEE 1541 is closely related to Amendment 2 to IEC International Standard IEC 60027-2, except the latter uses'bit' as the symbol for bit, as opposed to'b'.
Split into simpler sentences: IEEE 1541 is closely related to Amendment 2 to IEC International Standard IEC 60027-2. This standard uses'bit' as the symbol for bit, as opposed to'b'.