Complex sentence: The introduction of the Battlizer is an annual tradition in "Power Rangers", having started in "Power Rangers in Space", as a device that allowed the Rangers to control the Delta Megazord.
Split into simpler sentences: The introduction of the Battlizer is an annual tradition in "Power Rangers". It is commonly thought that the Battlizer tradition started in "Power Rangers in Space", as a device that allowed the Rangers to control the Delta Megazord.