Complex sentence: Two British doctors, Alistar Hay and John Fran found no hints of poison and for "The Lancet" newspaper they acknowledged that the only explanation for this collapse was the "mass hysteria".
Split into simpler sentences: Two British doctors, Alistar Hay and John Fran. They found no hints of poison and for "The Lancet" newspaper; they acknowledged that the only explanation for this collapse was the "mass hysteria".