Complex sentence: "Sakaldwipiya" is a tadbhav of Sanskrit "Shakadvipiya", an "-iya" adjective of "Shakadvipa", one of the "dvipa" ("continents") of Hindu mythology.
Split into simpler sentences: Sakaldwipiya is a tadbhav of Sanskrit "Shakadvipiya". The Sanskrit word is in turn an "-iya"adjective of "Shakadvipa", one of the "dvipa"("continents") of Hindu mythology.