Complex sentence: Before Medicare's creation, only half of older adults had health insurance, with coverage often unavailable or unaffordable to the other half, because older adults had half as much income as younger people and paid nearly three times as much for health insurance.
Split into simpler sentences: Before Medicare's creation, only half of older adults had health insurance, with coverage often unavailable or unaffordable to the other half. Older adults had half as much income as younger people and paid nearly three times as much for health insurance.