I have a column called 'Player' in a data frame 'players'. The type is 'factor'.
It has values like:
1. Afsar Zazai (AFG),
2. Jubair Hossain (BDESH),
3. Salman Farooq (UAE),
4. Soumya Sarkar (BDESH),
5. Mohammad Nawaz (3) (PAK),
6. Taijul Islam (BDESH)

How can I remove everything inside parentheses, but only when it is not a number. So, the column should look like this after cleansing:
1. Afsar Zazai,
2. Jubair Hossain,
3. Salman Farooq,
4. Soumya Sarkar,
5. Mohammad Nawaz (3),
6. Taijul Islam