Complex sentence: She started her music career in South Korea in late 2005 singing "Miracle" a well now song in South Korea within a month she was chosen by Avex's Show Case Live because she was able to speak Japanese.
Split into simpler sentences: She started her music career in South Korea in late 2005 singing "Miracle", a well known song in South Korea. Within a month she was chosen by Avex's Show Case Live because she was able to speak Japanese.