Complex sentence: During contact with higher existences we should be very careful, because not all of them are Gods or Goodies (or "demi-gods" or "angels") indeed and demonic worlds are full of spirits as well, even often pretending to be Gods.
Split into simpler sentences: During contact with higher existences we should be very careful, because not all of them are Gods or "demi-gods" or "angels". Indeed and demonic worlds are full of spirits as well, even often pretending to be Gods.