Complex sentence: In general, the study was straightforward and had a clear goal; however, they should have given more information about how they were able to control for social class, age, and obesity when analyzing the results.
Split into simpler sentences: In general, the study was straightforward and had a clear goal. One critique is that the report of the study should have included more information about how the researchers were able to control for social class, age, and obesity when analyzing the results.