Complex sentence: The spotlight moves to Louise, the maid, who is found out to be Marcel's mistress, yet declares her love for Gaby, yet expresses disappointment in her for her weakness and indecision.
Split into simpler sentences: The spotlight moves to Louise, the maid, who is found out to be Marcel's mistress. She declares, however, affection for Gaby, but also expresses disappointment in her for her weakness and indecision.