Complex sentence: In 2006, after 10 years, the Great Eastern Run returned to the racing calendar, around 3,000 runners raced through the flat streets of Peterborough for the half-marathon, supported by thousands of spectators along the course.
Split into simpler sentences: In 2006, after 10 years, the Great Eastern Run returned to the racing calendar. Around 3,000 runners raced through the flat streets of Peterborough for the half-marathon, supported by thousands of spectators along the course.