Complex sentence: In 2013 the US Food and Drug Administration (FDA) ordered 23andMe to discontinue marketing its personal genome service (PGS) as the company had not obtained the legally required regulatory approval resulting in concerns about the potential consequences of customers receiving inaccurate health results.
Split into simpler sentences: In 2013 the US Food and Drug Administration (FDA) ordered 23andMe to discontinue marketing its personal genome service (PGS), as the company had not obtained the legally required regulatory approval. That resulted in concerns about the potential consequences of customers receiving inaccurate health results.