Identify the : I stood at the window, but I didn't see him.

Both are independent clauses, joined by "but."

The sentence "I stood at the window, but I didn't see him" is a simple sentence consisting of two clauses, joined together by the coordinating conjunction "but". Let's break it down further to identify each component:

1. Subject: The subject of the sentence is "I", referring to the person who stood at the window.
2. Verb Phrase: The verb phrase is "stood at the window", indicating the action performed by the subject.
3. Object: The object of the verb "see" is "him", indicating the person the subject didn't see.

So, to summarize:
- Subject: I
- Verb Phrase: stood at the window
- Conjunction: but
- Verb: didn't see
- Object: him