This sentence is ambiguous — **"he"** could refer to either the doctor or the nurse (assuming the nurse is male). Here are both possible continuations:

1. **"He" = the nurse:** The doctor phoned the nurse because he (the nurse) was late — *so she wanted to find out where he was.*

2. **"He" = the doctor:** The doctor phoned the nurse because he (the doctor) was late — *so he wanted to let her know he'd be delayed.*

The sentence is actually a classic example used in linguistics and AI research (known as a **Winograd schema**) to illustrate how pronoun resolution depends on context and common-sense reasoning.
