Complex sentence: The plant is closely related to Gardenia and produces white flowers that are 1.5-2 inches in diameter, star shaped, very fragrant, tubular and attract nocturnal moths.
Split into simpler sentences: The plant is closely related to Gardenia and produces white flowers that are 1.5-2 inches in diameter. The flowers were star shaped, very fragrant, tubular and tends to attract nocturnal moths.