Complex sentence: The Leyland Cypress, "× Cupressocyparis leylandii" (syn. "Callitropsis × leylandii"), often referred to as just Leylandii, is a fast-growing evergreen tree much used in horticulture, primarily for hedges and screens.
Split into simpler sentences: The Leyland Cypress, "× Cupressocyparis leylandii" (syn. "Callitropsis × leylandii"), is often referred to as just Leylandii. It is a fast-growing evergreen tree much used in horticulture, primarily for hedges and screens.