Complex sentence: Synthroid, produced by Abbott Laboratories, is the brand name counterpart to the generic levothyroxine, and the most common synthetic thyroid medication; it is taken by over 40% of people with hypothyroidism.
Split into simpler sentences: Synthroid, produced by Abbott Laboratories, is the brand name counterpart to the generic Levothyroxine. Synthroid is also the most common pill prescribed by doctors that has the synthetic thyroid hormone in it, and it is taken by over 40% of people with hypothyroidism.