Response:
[See Below]
Clarification:
"Jack intends to hike in the mountains and wishes to borrow my boots, but I'm uncertain if they will be suitable for him."
✦ This sentence functions as both a compound and a complex structure.
✧ It's complex because it features both a dependent clause and an independent one, linked by a conjunction.
✧ It's compound as it contains a subject and predicate and utilizes FANBOYS: For, And, Nor, But, Or, Yet, So.
~I hope this is useful, mate. Don’t hesitate to reach out if you need anything.