In [85]: df[0].str.split('_').str[1:].str.join('_') Out[85]: 0 toronto_maple-leafs_Canada 1 boston_bruins_US 2 detroit_red-wings 3 montreal Name: 0, dtype: object
In [85]: df[0].str.split('_').str[1:].str.join('_') Out[85]: 0 toronto_maple-leafs_Canada 1 boston_bruins_US 2 detroit_red-wings 3 montreal Name: 0, dtype: object