Complex sentence: Faye Chism, her husband John and their 3-year-old son, Ricky, were standing right at the Dealey Plaza Elm Street north curbstone at the eastern base of the grassy knoll, only 14' from President Kennedy at the start of the assassination.
Split into simpler sentences: Faye Chism, her husband, and their 3-year-old son, were all standing together right up to the Dealey Plaza Elm Street north curbstone located at the eastern base of the grassy knoll. Chism was only 14' from President Kennedy at the very start of the assassination.