Complex sentence: In February 1903 they infiltrated the vivisection in University College of a brown terrier dog who they said was dissected while conscious in front of an audience of medical students, then included a vivid description of the experiment in their diary, "The Shambles of Science".
Split into simpler sentences: In February 1903 they infiltrated the vivisection in University College of a brown terrier dog who they said was dissected while conscious in front of an audience of medical students. They included a description of the experiment in their book, "The Shambles of Science".