Complex sentence: The most common method of cultivating "M.pyrifera" was developed in China in the 1950s called the long line cultivation system, where the sporelings are produced in a cooled water greenhouse and then later planted out in the ocean attached to long lines.
Split into simpler sentences: The most common method of cultivating "M.pyrifera" was developed in China in the 1950s called the long line cultivation system. Mariculture of Seaweeds Where the sporelings are produced in a cooled water greenhouse and then later planted out in the ocean attached to long lines.