Complex sentence: The laboratory was where Weber experimented with blood, which was analyzed by the inmate physician Dr. Slavka Kleinová, among other prisoners, who were bled and injected prisoners with other blood groups, in order to test the compatibility of bloodtypes.
Split into simpler sentences: The laboratory was where Weber experimented with blood, was passed by the inmate physician Dr. Slavka Kleinová. Among other prisoners, who were bled and injected prisoners with other blood groups, in order to test the compatibility of bloodtypes.