Complex sentence: She began her career in 2001 with the release of'Itoshigo yo' when she was signed to Toshiba-EMI and has released a total of 4 regular albums and 8 singles thus far.
Split into simpler sentences: She began her career in 2001 with the release of'Itoshigo yo' when she was signed to Toshiba-EMI. She has released a total of 4 regular albums and 8 singles thus far.