Complex sentence: When Galahad arrives to the court, Guinevere is upset with Lancelot because he does not want to be her lover anymore and she takes an interest in the young knight, persuading him to go above and beyond regular knightly duties.
Split into simpler sentences: When Galahad arrives to the court Guinevere, who is upset with Lancelot because he does not want to be her lover anymore, takes an interest in the young knight. She persuades him to go above and beyond regular knightly duties.