en_tn/act/19/08.md

Paul went into the synagogue and spoke boldly for three months

"Paul regularly attended the synagogue meetings for three months and spoke there boldly"

reasoning and persuading them

"convincing people with convincing arguments and with clear teaching"

about the kingdom of God

Here "kingdom" stands for God's rule as king. AT: "about God's rule as king" or "about how God would show himself as king" (See: rc://en/ta/man/translate/figs-metonymy)