Complex sentence: Charles F. Brehm and his 5-year-old son, Joe, were standing in the Dealey Plaza north infield grass, a few feet south of the south curb of Elm Street, across the street from Abraham Zapruder and the Dealey Plaza grassy knoll.
Split into simpler sentences: Charles F. Brehm and his 5-year-old son, Joe, were standing in the Dealey Plaza north infield grass, a few feet south of the south curb of Elm Street. They were across the street from Abraham Zapruder and the Dealey Plaza grassy knoll.