Identify the subject, verb, compliment, adj and prepositional phrase and adverb

Question

1. A couple of months ago, Juana and I finally decided to buy a houseplant for the kitchen.
2. The large ones we saw were too expensive for us.
3. “Let’s buy some seeds and grow them indoors.”

1. Juana, I-subj, decided-verb, finally, adverb, couple-adj, of months ago, for the kitchen-prep phrase, to buy-compliment
2. we saw-verb, were-compliment
3. let's-subject, buy, grow-verb, indoors-adverb, seeds-compliment

Answer 1

2. We saw is subordinate clause, not the main clase.
3. No.
What does "let's" mean?

Answer 2

2. one-subj, were -verb, expensive-compliment, too-adverb, large-adj, for us=prep phrase
3. seeds-subject, grow-verb, indoors-adverb, some-adj, them-compliment