Complex sentence: The LSRCA was started in 1951 by the Department of Planning and Development as the "Upper Holland Valley Conservation Authority", founded by the municipalities of East Gwillimbury, Township of King, Aurora, Newmarket, and Whitchurch.
Split into simpler sentences: The LSRCA was established in 1951 by the Department of Planning and Development as the "Upper Holland Valley Conservation Authority". It was founded by the municipalities of East Gwillimbury, Township of King, Aurora, Newmarket, and Whitchurch.