# the people of the city were divided
"the people of the city disagreed with each other"
# sided with the Jews
"supported the Jews" or "agreed with the Jews." The first group mentioned did not agree with the message about grace.
# with the apostles
The second group mentioned agreed with the message about grace. It may be helpful to restate the verb. Alternate translation: "sided with the apostles" (See: [[rc://en/ta/man/translate/figs-ellipsis]])
# the apostles
Luke refers to Paul and Barnabas. Here "apostle" might be used in the general sense of "ones sent out."