Complex sentence: Fast Retailing had held a 32.32% stake in LTH since 2004 and, in spring 2009, after acquiring the remaining stock, LTH became a fully owned subsidiary of Fast Retailing.
Split into simpler sentences: Fast Retailing had held a 32.32% stake in LTH since 2004. In spring 2009, Fast Retailing acquired the remaining stock and LTH became a fully owned subsidiary of Fast Retailing.