In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
One example: The Inheritance Cycle is a series of fantasy books written by Christopher Paolini.
Solution is here: The Inheritance Cycle is a tetralogy of young adult high fantasy novels written by American author Christopher Paolini.
Explanation: The output sentence elaborates on the input sentence without changing its general meaning e.g. "tetralogy of young adult high fantasy novels".

Now, solve this: When the storm became a tropical cyclone , it was also the first Atlantic tropical storm in the month of April .
Solution:
After attaining tropical characteristics , it became the first tropical storm on record in the month of April , and was among the earliest forming tropical or subtropical cyclones in the Atlantic basin .