Complex sentence: A year as a redshirt player in college counts toward eligibility even though the player was not allowed to participate in games during that year, therefore players who have completed their redshirt sophomore year can enter the NFL draft.
Split into simpler sentences: A year as a redshirt player in college counts toward eligibility even though the player was not allowed to participate in games during that year. Therefore players who have completed their redshirt sophomore year can enter the NFL draft.