What type of phrase or clause is “was attending”

The correct answer is: the verb phrase.

Explanation:

The verb phrase consists of a main verb alone, or the main verb + any auxiliary or modal verbs.  

In this case, the verb phrase was attending has a continuous meaning. It's a syntactic unit composed of at least one verb and its dependents (objects, complements and other modifiers), and not always includes the subject.

The verb phrase is similar to what is considered a predicate.

you didn't provide the passage.

explanation:

seeing as this is your first question on i can see why you may have not known that you need to provide the passage.

without the passage, or even the name of the passage, we can not read the passage, therefore we can not determine when or how the pacing effects the tone.

however, you can either repost this question (providing the passage this time)

or you can comment below what the passage is, and i'll you to the best of my ability!

because most jews were in the concentration camps and dying horrible deaths while anne could be with her family in a warm place with shelter, food, water, and a place to sleep.