input: 
  from typing import Tuple
  
  
  def replace_word_in_sentence(sentence: str, old_word: str, new_word: str) -> Tuple[str, str]:
      """ Replace a given word in a sentence with another word and return the modified sentence along with the original sentence.
      >>> replace_word_in_sentence("I love walking on the beach", "walking", "swimming")
      ("I love swimming on the beach", "I love walking on the beach")
      >>> replace_word_in_sentence("Life is like a box of chocolates", "box", "box")
      ("Life is like a box of chocolates", "Life is like a box of chocolates")
      """
  
output:     modified_sentence = sentence.replace(old_word, new_word)
      return modified_sentence, sentence