Simplify the following text for a Grade 12 native English-speaking person.
Original: Below is a list of the 14 ( 15 ) autocephalous churches in their order of precedence ( seniority ) with constituent autonomous churches and exarchates .
Simplified: Nowadays , there are 14 ( 15 by some ) independent orthodox churches , in communion with each other , with the precise order of seniority of their heads as listed below .