Simplify the following text for a Grade 7 native English-speaking person.
Original: Charles II ( 29 May 1630 OS â `` 6 February 1685 OS ) was monarch of the three kingdoms of England , Scotland , and Ireland .
Simplified: Charles II ( 29 May 1630 â `` 6 February 1685 ) , was king of England , Ireland , and Scotland , from 1649 to 1685 .