Complex sentence: After successfully shrinking and regrowing him (despite a height and hat size change), they return their children to their normal size and the Szalinskis and the Thompsons embrace, and a friendship is formed between Russ Sr and Wayne.
Split into simpler sentences: After successfully shrinking and regrowing him (despite a height and hat size change), they return their children to their normal size. The Szalinskis and the Thompsons embrace, and a friendship is formed between Russ Sr and Wayne.