Complex sentence: Chris Richards of "The Washington Post" defined Knowles' character in the song as a "jealousy-crazed ex", and expressed his disappointment that the song could not manage a more convincing refrain.
Split into simpler sentences: Chris Richards of "The Washington Post" defined Knowles' character in the song as a "jealousy-crazed ex". He also expressed his disappointment about the fact that the song could not manage a more convincing refrain.