Complex sentence: John "Jack" R. Horner (born June 15,1946) is an American paleontologist who discovered and named the "Maiasaura", providing the first clear evidence that some dinosaurs cared for their young.
Split into simpler sentences: John "Jack" R. Horner (born June 15,1946) is an American paleontologist. Horner discovered and named the "Maiasaura", providing the first clear evidence that some dinosaurs cared for their young.