Complex sentence: While very forgiving, even Dr. Kroger gets fed up with Monk from time to time, most heavily demonstrated in "Mr. Monk and the Sleeping Suspect", where Dr. Kroger comes back from vacation in Costa Rica and sees Monk standing outside his home.
Split into simpler sentences: While very forgiving, even he gets fed up with Monk from time to time, most heavily demonstrated in "Mr. Monk and the Sleeping Suspect". Kroger returns from vacation in Costa Rica and sees Monk standing outside his home.