Complex sentence: Though most movies are based on domestic box office sales, Jim Carrey's $20 million salary raises the budget to $67 million; plus, the huge advertising campaign places the profit to slim to negative numbers.
Split into simpler sentences: Though most movies are based on domestic box office sales. Jim Careys $20 Million dollar salary raises the budget to $67 million, plus the huge advertising campaign places the profit to slim to negative numbers.