Complex sentence: Nobber was once an important town in the Kingdom of Meath, and the "Rectory of Nobber" was united to this dignity; thus the holder was sometimes called "Rector or Parson of Nobber", or more commonly styled "Archdeacon of Nobber".
Split into simpler sentences: Nobber was once an important town in the Kingdom of Meath, and the "Rectory of Nobber" was united to this dignity. Thus, the holder was sometimes called "Rector or Parson of Nobber", but more commonly styled as "Archdeacon of Nobber".