Κοιμάμαι εύκολα κατά την διάρκεια που παρακολουθώ τηλεόραση.

English Translation

I fall asleep easily while watching television.

κατά την διάρκεια: This is a phrase that means “during” or “in the course of.” “Κατά” is a preposition, “την” is the feminine accusative singular form of the definite article “the,” and “διάρκεια” is a feminine noun meaning “duration.”