Connecting independent clauses

[navdeep_bajwa]

Source http://grammar.ccc.commnet.edu/grammar/ ... ns.htm#top

"The club never invested foolishly, but used the services of a sage investment counselor."

How is this sentence correct the part after "but" is not an independent clause

[kartik1979]

But leads a dual life as an adverb and a
conjunction, but it is in the latter form that you'll usually see it. But is most often used in a sentence to show
opposition or concession to what has come before, though in some cases the only thing it "opposes" is the idea
that what was just said is all there is to say on the subject:
Opposition: They want to go to the concert, but they don't want to pay for it.
Concession: I would tell her how much peaches upset me, but she went to all the trouble of baking a
peach pie for me!
Exception (used the way except for is used): Test day for the GMAT worried everyone but me because of
all the time I'd spent practicing.
Continuation of initial statement: I want you not only to go to Ireland, but also to take as many pictures as
you can while you're there.
Elaboration: The girls never made much money selling cookies, but stayed home watching television all
summer.
For comparison, this is the adverbial use of but (used the way only is used): I am but a man, and can only
do so much in a day.