Complex sentence: The very first race was held on the 29th April, when the Leicester Query Club organised a motorcycle meeting, cars appearing on Whit Monday, in event being organised by Nottingham Sports Car Club.
Split into simpler sentences: The very first race was held on the 29th April, when the Leicester Query Club organised a motorcycle meeting. Cars first appeared at the Whit Monday meeting, in event being organised by Nottingham Sports Car Club.