Complex sentence: The uncertainty of track position measurements (position resolution) is about 200 micrometres, not as precise as those for the other two detectors, a necessary sacrifice for reducing the cost of covering a larger volume and having transition radiation detection capability.
Split into simpler sentences: The uncertainty of track position measurements (position resolution) is about 200 micrometres. This is not as precise as those for the other two detectors, but it was necessary to reduce the cost of covering a larger volume and to have transition radiation detection capability.