Complex sentence: Companies began offering insurance policies during world war II to attract talent from the reduced supply of workers, a practice later cemented by tax policies that encouraged untaxed benefits (such as health care) rather than taxable ones such as cash.
Split into simpler sentences: Companies began offering insurance policies during the second world war to attract talent from the reduced supply of workers. Later, the practice was cemented by tax policies that encouraged untaxed benefits (such as health care) rather than taxable ones such as cash.