Complex sentence: Mr. Drew tells Nancy to go to Twin Elms with Helen and help Miss Flora and Mrs. Hayes, as he will be traveling to Chicago during the first part of Nancy's stay at the old estate and join her later.
Split into simpler sentences: Mr. Drew tells Nancy to go to Twin Elms and help the Miss Flora and Mrs.Hayes. He also says he will be traveling to Chicago during the first part of Nancy's stay at the old estate and join her later.