Original: As the men and Mimì dine at the cafe, Musetta, formerly Marcello's sweetheart, arrives with her rich (and aging) government minister admirer, Alcindoro, to whom she speaks as she might to a lapdog.
Simplified: As the men and Mimi dine at the café, Musetta, who used to be Marcello's sweetheart, arrives with Alcindoro, an old, rich minister.