Complex sentence: What free time he has, Johnnie spends with his girlfriend Jill Standish, an even more callous travel agent who encourages Johnnie to take active measures to accelerate his grandmother's death, so that the two of them can get married and retire on Alice's fortune.
Split into simpler sentences: What free time he has, Johnnie spends with his girlfriend Jill Standish, an even more callous travel agent. Jill encourages Johnnie to take active measures to accelerate his grandmother's death, so that the two of them can get married and retire on Alice's fortune.