Complex sentence: Grandpa takes the children to the attic where he pulls out his old bowler hat, gold-tipped cane, and his tap shoes, and starts performing, telling jokes, dancing and singing, making the children laughing so hard, having a great time.
Split into simpler sentences: Grandpa takes the children to the attic, where he pulls out his old bowler hat, gold-tipped cane, and his tap shoes. He starts performing, telling jokes, dancing and singing, making the children laugh very hard and have a great time.