Complex sentence: Coppell city officials were investigating Jayne Peters' misuse of a city issued credit card with personal charges from the mayor that had not been reimbursed after repeated requests from city officials.
Split into simpler sentences: Coppell city officials were investigating Jayne Peters' misuse of a city issued credit card with personal charges by the mayor. Mayor Peters did not reimburse the city for personal charges after repeated requests from city officials.