import re

line = "Nederlands liberaal (?-012341965)"
line = re.sub(
           r"\([0-9]*-[0-9]*\)", 
           "", 
           line
       )
line = re.sub(
           r"\([0-9]*-[?]\)", 
           "", 
           line
       )
line = re.sub(
           r"\([?]-[0-9]*\)", 
           "", 
           line
       )
print (line)
Nederlands liberaal