Complex sentence: Tony decides to buy A.J. a new Nissan Xterra as a "motivational tool" to get better grades, saying that Carmela will keep the keys until his grades improve.
Split into simpler sentences: Tony decides to buy A.J. a new Nissan Xterra as a "motivational tool" to get better grades. Tony tells A.J. that Carmela will keep the keys until his grades improve.