He rehearsed (exēgeito). Imperfect middle of exēgeomai, old verb to lead out, to draw out in narrative, to recount. So Paul is pictured as taking his time for he had a great story to tell of what had happened since they saw him last.
One by one (kath' hena hekaston). According to each one (item) and the adverbial phrase used as an accusative after the verb exēgeito as Demosthenes does (1265), though it could be like kath' hena hekastos in Eph 5:33.
Which (hōn). Genitive attracted from ha (accusative) into the case of the unexpressed antecedent toutōn.
God had wrought (epoiēsen ho theos). Summary constative aorist active indicative that gathers up all that God did and he takes pains to give God the glory. It is possible that at this formal meeting Paul observed an absence of warmth and enthusiasm in contrast with the welcome accorded by his friends the day before (Act 21:17). Furneaux thinks that Paul was coldly received on this day in spite of the generous offering brought from the Gentile Christians. “It looks as though his misgiving as to its reception (Rom 15:31) was confirmed. Nor do we hear that the Christians of Jerusalem later put in so much as a word on his behalf with either the Jewish or the Roman authorities, or expressed any sympathy with him during his long imprisonment at Caesarea” (Furneaux). The most that can be said is that the Judaizers referred to by James do not appear actively against him. The collection and the plan proposed by James accomplished that much at any rate. It stopped the mouths of those lions.