Complex sentence: Automobile dealers who still wanted to sell cars had to find a way to deal with the increasing price of vehicles relative to income and sell them to wary consumers who were unwilling or unable to pay cash for the new purchase.
Split into simpler sentences: Automobile dealers who still wanted to sell cars had to find a way to deal with the increasing price of vehicles relative to income. They had to sell these vehicles to wary consumers who were unwilling or unable to pay'cash' for the new purchase.