Subsequent is a time later or more recent than.
![\huge\boxed{\text{Pronoun}}](https://tex.z-dn.net/?f=%5Chuge%5Cboxed%7B%5Ctext%7BPronoun%7D%7D)
In the English language, the word "who" is almost always used as a pronoun.
It represents a person, similar to the words "I" and "me".
"will produce" is future perfect tense. The word "will" means it hasn't happened yet, which means it couldn't possibly be past or present. The word "will" is also a give away that it is future perfect and not just future.