The sentences are fine as they are. They are quite long with complex structures, so they are only suitable for a formal context.
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Nona The BritThey are quite long with complex structures, so they are only suitable for a formal context.Thank you, Nona. These are two paragraphs for a PG essay I'm writing, so I think a formal register is appropriate.
Mister Micawber3-- the South Korean GDP
no comma after dramatically changed