"Tetralogy", which is a literary or theatrical work consiting of four distinct parts, is likely the word that is meant here; where as "tetraolgy" could be short for "tetraolgy of fallout" (TOF), which is a congenital birth defect of the heart that causes "blue baby" or cyanosis, which requires corrective surgery.
1. Sigrid Undset's The Master of Hestviken tetralogy, "The Axe", "The Snake Pit", "In the Wilderness", and "The Son Avenger" were published in 1925 and 1927.
2. The baby was born with Tetraolgy of Falot, making his skin appear blue.
i do not know how to use embalming in a sentence. (there is the sentence)
So- you are asking when to use 'when' in a sentence. When you are asking how to use when in a question, you are already using when in a sentence, because a question actually is a sentence. I like to use when in a sentence whenever I like.
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Use it in a big sentence.