Complex sentence: As of January 3,2014, only 2 million people had selected a health plan through the health insurance marketplaces., but by April 19,2014,8.02 million people had signed up through the health insurance marketplaces and an additional 4.8 million joined Medicaid.
Split into simpler sentences: As of January 3,2014, only 2 million people had selected a health plan through the health insurance marketplaces. By April 19,2014,8.02 million people had signed up through the health insurance marketplaces and an additional 4.8 million joined Medicaid.