Complex sentence: Rachael, however, is "uncomfortable" going into the hospital during Adam's chemo treatments and is often late to pick him up, as Adam doesn't drive; she also gets him a retired racing greyhound named Skeletor as a companion animal.
Split into simpler sentences: Rachael, however, is "uncomfortable" going into the hospital during Adam's chemo treatments and is often late to pick him up, as Adam doesn't drive. She also gets him a retired racing greyhound named Skeletor as a companion animal.