Complex sentence: It is named in honour of the physicists Henri Abraham, Eugène Bloch and Georges Bruhat, who established the physics laboratory at the ENS and who all died in Nazi concentration camps from 1943 to 1945.
Split into simpler sentences: It is named in honour of the physicists Henri Abraham, Eugène Bloch and Georges Bruhat, who established the physics laboratory at the ENS. The three physcicists died in Nazi concentration camps from 1943 to 1945.