Complex sentence: Today there are a few groups and websites who promote the Bayside apparitions but essential to understanding who is in charge of this Mission, one has to take into consideration that shortly before her death, Mrs. Lueken appointed Michael Mangan to lead the Mission after her.
Split into simpler sentences: Today there are a few groups and websites who promote the Bayside apparitions. Shortly before her death, Mrs. Lueken appointed Michael Mangan to lead the Mission after her.