Simplify the following text for a Grade 12 native English-speaking person.
Original: The voivode ( literally , `` leader of warriors '' , equivalent to Dux Exercituum or Herzog ) was originally the military commander next to the ruler .
Simplified: The voivod ( literal translation : `` the one who leads the warriors '' , is the same as to Dux Exercituum \/ Herzog ) was originally the military commander next to the ruler .