code: def _trim_zeros_complex(str_complexes, na_rep='NaN'):
      
      def separate_and_trim(str_complex, na_rep):
          num_arr = str_complex.split('+')
          return (_trim_zeros_float([num_arr[0]], na_rep) +
                  ['+'] +
                  _trim_zeros_float([num_arr[1][:-1]], na_rep) +
                  ['j'])
  
      return [''.join(separate_and_trim(x, na_rep)) for x in str_complexes]
docs: Separates the real and imaginary parts from the complex number, and
      executes the _trim_zeros_float method on each of those.