Simplify the following text for a Grade 9 native English-speaking person.
Original: Simon Episcopius ( 1583 â `` 1643 ) was spokesman of the 13 representatives of the Remonstrants who were summoned before the Synod in 1618 .
Simplified: Simon Episopius was the speaker for the 13 members of the Remonstrants who were called to the Synod in 1618 .