Complex sentence: If a wrong capacitance value is installed, it will cause an uneven magnetic field which causes the rotor to hesistate at those spots that are uneven, which can be observed as uneven motor rotation speed, especially under load.
Split into simpler sentences: If a wrong capacitance value is installed, it will cause an uneven magnetic field around the rotor. This causes the rotor to hesistate at the uneven spots, resulting in irregular rotation, especially under load.