Q: I lost two Leyland cypresses in a bad storm. The three left standing are brown on the interior of the tree. The outside of the tree is green.Will the brown side eventually turn green, now that it will receive sun light?
A: In a word, no.
Needled evergreens like Leyland cypress do not sprout from brown stems. The bad side of your remaining trees will look like that forever. Consider planting another evergreen, like ‘Emerald Green’ arborvitae to mask the dead area.