Complex sentence: The police wrongly suspect Gail murdered Joe and Tina starts to believes this, banning Gail from Joe's funeral and on learning that Gail is planning to go to Italy, she tells the police of her suspicions.
Split into simpler sentences: The police wrongly suspect that Gail murdered Joe and Tina starts to believes this, banning Gail from Joe's funeral. On learning that Gail is planning to leave the country, she tells the police of her suspicions.