Complex sentence: Jenna Miscavige Hill (born February 1,1984) is an American former Scientologist who, after leaving the Church of Scientology in 2005, has become an outspoken critic of the organization.
Split into simpler sentences: Jenna Miscavige Hill (born February 1,1984) is an American former Scientologist. After leaving the Church of Scientology in 2005, has become an outspoken critic of the organization.