input: Write a python function to determine if two sentences are anagrams by using the provided AnagramDetector class.
  assert AnagramDetector("A gentleman", "Elegant man").is_anagram() == True
  assert AnagramDetector("Clint Eastwood", "Old West Action").is_anagram() == True
  assert AnagramDetector("The eyes", "They see").is_anagram() == True
  assert AnagramDetector("Hello", "World").is_anagram() == False
output: class AnagramDetector:
      def __init__(self, sentence1, sentence2):
          self.sentence1 = sentence1
          self.sentence2 = sentence2
  
      def is_anagram(self):
          def clean_string(s):
              return ''.join(e for e in s if e.isalnum()).lower()
  
          return sorted(clean_string(self.sentence1)) == sorted(clean_string(self.sentence2))