Complex sentence: HARPS can attain a precision of 0.97 m/s (3.5 km/h), with an effective precision of the order of 30 cms-1, making it one of only two instruments worldwide with such accuracy.
Split into simpler sentences: HARPS can attain a precision of 0.97 m/s (3.5 km/h),. Although, with an effective precision of the order of 30 cms-1 one of only two instruments worldwide with such accuracy.