Complex sentence: For a positive number written in a conventional positional numeral system (such as binary or decimal), its fractional part hence equals the digits appearing after the radix point, equivalently, it equals the original number with the digits before the radix point substituted with 0.
Split into simpler sentences: For a positive number written in a conventional positional numeral system (such as binary or decimal), the fractional part equals the digits appearing after the radix point. Equivalently, it equals the original number with the digits before the radix point substituted with 0.