First, you may want to look at "types of adverbial clauses". Click here:
Second, you may want to look at what reduced adverbial clauses look like and how they are formed. Click here: http://depts.gallaudet.edu/englishwo...alclauses.html
Third, is 'having worked a couple of years' related to 'ready for retirement'?
Lastly, if you're interested in the linguistic side of things (and some heavy reading), try a search under the term supplementive clauses.
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