Now after many years I came to bring alms to my nation, and offerings.
Now after many ('several') years - years' absence from Jerusalem.
I came to bring alms to my nation - referring to the collection from the churches of Macedonia and Greece, which he had taken such pains to gather. This only allusion in the Acts to what is dwelt upon so frequently in his own Epistles (Romans 15:25-26; 1 Corinthians 16:1-4; 2 Corinthians 8:1-4 ) throws a beautiful light on the truth of this History. (See Paley's Horae Paulinae, chapter 2:1.)
And offerings - connected with his Jewish vow (see next verse).