Complex sentence: In 1385, she became abbess, though the convent was still not officially recognized; on 18 May 1388, after the Vadstena Abbey was officially recognized by the Pope, she was ordained as its first official abbess.
Split into simpler sentences: In 1385, she became abbess, although the abbey was still not officially recognized. On 18 May 1388, after the Vadstena Abbey was officially recognized by the Pope, she was ordained as its first official abbess.