This is so simple. And it's really, really good.
4 cups chopped cooked chicken
2 cups diced celery
1 cup mayonnaise or Miracle Whip
20-ounce can pineapple chunks, drained
1 cup chopped pecans
2 11-ounce cans mandarin oranges, drained
1 pound seedless green grapes
Combine all ingredients in a large bowl. Toss until well mixed. Chill.