Complex sentence: Because "S. caprae" is difficult to identify definitively in the laboratory, according to a study in 2014, the incidence of S. caprae in humans in under-reported.
Split into simpler sentences: Because "S. caprae" is difficult to identify definitively in the laboratory, it likely occurs more often than the medical literature suggests. According to a study in 2014, the incidence of S. caprae in humans in under-reported.