Wow! Your knowledge is incredible!

I somehow understood eveything you said, thanks. Except for when you said this:
We have become friends sharing passions. ...
where the "friends sharing passions..." is the direct object of the verb. Friends is the subject of the gerund phrase.
1) In bold, friends sharing passions is the object of what verb?
Have become?
2) Also, when you have a verb form, but it is the ing form; is it always a non-finite/verbal, which means it is a phrase-either a gerund or particple?
3) Additionally, have I punctuated the sentence above correctly?
Also, when you have a verb form=conjunctive adverb and subordinate clause
,but it is the ing form=coordinating conjunction and independent clause
;is it always a non finite/verbal=this is the question, but it is still an indep. clause, so it needs more than a comma to separate it from the preceding clause, correct?
which means (that) it is a phrase=relative clause?? two relative clauses??
either a gerund or paticiple=???
Sorry for going off-track slightly- (I am) just making the most of your expertise

4) Lastly, see this is another major question of mine, too, haha! After the hyphen, it is an independent clause with the subject and linking verb omitted, correct? (I am). Is it now a phrase and therefore a hyphen or comma is correct to seperate it from the main clause?
Thanks so much!!