'Spread thin' is a phrase commonly used in reference to a person who has too many responsibilities. For example: "Between his job at the factory, being a dedicated father, and taking university classes online, Tom is spread pretty thin."
What are some ways to translate this expression and similar ones of 'juggling too many balls at once,' 'having a lot on one's plate,' or 'biting off more than one can chew?' (I would say all these have roughly the same meaning of having more work than one can easily manage.)