Sentence Correction (SC) | Identifying Clauses

Hello,

I'm new to the GMAT circle. Kindly help me with my doubts in the below mentionedsentence-

After all the gardening we did, the sun shining on the flowerbeds makes a
beautiful sight. This sentence according to the Manhattan SC book is correct.


1) IsAfter all the gardening we did an independent clause? If yes, please point out the subject and working verb in there. If not, then why?
2) IfAfter all the gardening we did is an independent clause, then why is it not joined to the adjoining
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