Complex sentence: Based on measurements recalculated using data supplied by the Scottish Environmental Prptection Agency (SEPA) and ordnance survey maps as published in August 2010, at high tide the Nith is the tenth longest river in Scotland at 61.6 miles.
Split into simpler sentences: Based on measurements recalculated using data supplied by the Scottish Environmental Prptection Agency (SEPA) and ordnance survey maps as published in August 2010. At high tide the Nith is the tenth longest river in Scotland at 61.6 miles.