Complex sentence: The seven-coordinate coordination sphere for Ta (V), established by X-ray crystallography, can be viewed as a trigonal prism defined by six fluoride ions with the seventh fluoride ion positioned above the center of the one the three rectangular faces.
Split into simpler sentences: The seven-coordinate coordination sphere for Ta (V) was established by X-ray crystallography. The coordination sphere can be viewed as a trigonal prism defined by six fluoride ions with the seventh fluoride ion positioned above the center of the one the three rectangular faces.