Complex sentence: If resonant coupling is used, where the inductive coils are capacitively loaded so that they form a tuned LC circuit to a mutual frequency, significant power may be transmitted over a range of many times the coil diameters.
Split into simpler sentences: If resonant coupling is used, the coils are individually capacitively loaded so as to form a tuned LC circuit. If the primary and secondary coils are resonant at a common frequency, it turns out that significant power may be transmitted between the coils over a range of many times the coil diameters.