Complex sentence: Its former diocesan territory was distributed at this time among the still-existing neighbouring dioceses of Hildesheim, Osnabrück, and Münster, the imperial city of Bremen and the surrounding district being administered by the vicar-apostolic of the northern missions.
Split into simpler sentences: Its former diocesan territory was distributed at this time among the still-existing neighbouring dioceses of Hildesheim, Osnabrück, and Münster. The imperial city of Bremen and the surrounding district being administered by the vicar-apostolic of the northern missions.