Complex sentence: Having read the Bible, a gift from his sister, Sven imagines he is visited by three angels from time to time, whom he speaks to in a clear voice, making it clear that this dialog takes place in his own mind.
Split into simpler sentences: Having read the bible, a gift from his sister, Sven imagine that he his visited by three angels from time to time, whom he speaks to in a clear voice. Making it clear that this dialog takes place in his own mind.