In Damascus, the city governor acting under King Aretas guarded the city of Damascus [on purpose] to arrest me,
In Damascus the governor under Aretas the king kept the city of the Damascenes with a garrison, desirous to apprehend me:
In Damascus the governor under Aretas the king guarded the city of the Damascenes in order to take me:
At Damascus the governor under King Aretas was guarding the city of Damascus in order to capture me,
At Damascus, the governor of the nation under Aretas the king, watched over the city of the Damascenes, so as to apprehend me.