Complex sentence: The Atomic Gardening Society was set up in 1959 by Muriel Howorth in the UK; irradiated seeds were sold to the public; and a number of commercial plant varieties were developed and released.
Split into simpler sentences: The Atomic Gardening Society was set up in 1959 by Muriel Howorth in the UK. Irradiated seeds were sold to the public; and a number of commercial plant varieties were developed and released.