Simplify the following text for a Grade 8 native English-speaking person.
Original: While most old institution decline because of leadership problems , the samurai , he felt , were best able to solve this problem with a system of rewards and punishment .
Simplified: Institutions that were once under great leadership will later decline and more able men will be less likely to come to power . The samurai , he felt , were best able to overcome this through a system of rewards and punishment .