Simplify the following text for a Grade 8 native English-speaking person.
Original: This ended up being somewhat problematic when Calvin 's Uncle Max was in the strip for a week and could not refer to the parents by name , and was one of the main reasons that Max never reappeared .
Simplified: Calvin 's Uncle Max was in the strip for a week but could not refer to the parents by name , which was one of the main reasons Max never reappeared .