Complex sentence: Even though Lanley succeeds in winning over the entire town, including skeptical Lisa, his slick salesmanship doesn't win over Marge who is furious with the purchase, believing that the monorail is unsafe and suspects Lanley is a con-artist.
Split into simpler sentences: Even though Lanley succeeds in winning over the entire town, including skeptical Lisa, his slick salesmanship doesn't win over a more skeptical Marge who is furious with the town's purchase. She believes that the monorail is unsafe and suspects Lanley is a con-artist.