Complex sentence: Leslie decides not to attend the commendation ceremony so she can drive Ann home that night, cheering her up during the trip by telling her all the numerous embarrassing ways she has been dumped over the years.
Split into simpler sentences: Leslie decides not to attend the commendation ceremony so she can drive Ann home that night. On the way, Leslie cheers up Ann by telling her all the numerous embarrassing ways she has been dumped over the years.