Complex sentence: Bogus isolates objects while unit testing i.e., it does not require any information of classes or objects involved in testing object method, whereas Rspec Mocks require additional information regarding objects used in testing object.
Split into simpler sentences: Bogus isolates objects while unit testing i.e., it does not require any information of classes or objects involved in testing object method. Where as Rspec Mocks require additional information regarding objects used in testing object.