Complex sentence: The further away from 50.0 the index is, the stronger the change over the month, e.g. a reading of 55.0 points to a stronger increase in a variable than a reading of 52.5.
Split into simpler sentences: The further away from 50.0 the index is, the stronger the change over the month. E.g. a reading of 55.0 points to a stronger increase in a variable than a reading of 52.5.