Complex sentence: This is what contributes to the melt-in-your-mouth sensation when a marshmallow is consumed-when the marshmallow hits your tongue, it immediately starts to melt (due to your body temperature), going from a solid to a liquid.
Split into simpler sentences: This is what contributes to the melt-in-your-mouth sensation when a marshmallow is consumed. When the marshmallow hits your tongue, it immediately starts to melt due to the body temperature going from a solid to a liquid.