Complex sentence: Because of this Mach numbers should not be calculated by editors from maximum speeds and inserted into the specs, as this is and introduces errors, instead they should only be entered when properly sourced from reliable data, along with the conditions that the Mach number applies.
Split into simpler sentences: Because of this Mach numbers should not be calculated by editors from maximum speeds and inserted into the specs, as this is and introduces errors. Instead, they should only be entered when properly sourced from reliable data, along with the conditions that the Mach number applies.