Complex sentence: In Cornwall and west Devon hundreds of keen gardeners are contacted individually to perform a field trial of a new plant, the seeds grow rapidly into bulbous fungi, feet across but weighing only a pound or so.
Split into simpler sentences: In Cornwall and west Devon, hundreds of keen gardeners are contacted individually to perform a field trial of a new plant. The seeds grow rapidly into bulbous fungi, feet across but weighing only a pound or so.