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What is してきた?

> 文化という言葉は、芸術や学問など人間が生み出した高い達成度を持つもの（ハイカルチャー）を指すとともに、人間の社会が長年にわたって形成 **してきた**
> 慣習や振舞いの体系を指す
> ([source](https://ja.wikipedia.org/wiki/%E6%97%A5%E6%9C%AC%E3%81%AE%E6%96%87%E5%8C%96))

I suppose it's a conjugated form of する, but I [can't find
it](http://www.japaneseverbconjugator.com/Suru.asp).

I don't know if it has anything to do with this
[answer](https://japanese.stackexchange.com/questions/61007/what-
is-%E3%81%97%E3%81%A6%E3%81%8D-in-this-sentence).
CC BY-SA 4.0
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question
grammar subsidiary-verbs
What verb form is してきた?
して is the te-form of する, and きた is the past form of くる. Here, くる is one of the
Japanese [subsidiary verbs](https://japanese.stackexchange.com/q/18952/5010)
that adds a feeling of "over a period of time (up until now)". See:

  * [Difference between -ていく and -てくる](https://japanese.stackexchange.com/q/676/5010)
  * [What's the difference between 歩んでいった and 歩んできた?](https://japanese.stackexchange.com/q/25505/5010)

Technically speaking, subsidiary verbs like (-て)いく, (-て)しまう and (-て)みる are not
part of verb conjugations. They are different verbs, as the name suggests. The
conjugation list you linked does not show every possible combination of a verb
and a subsidiary verb because they are not conjugations in the first place.
(As an exception, the so-called "-teiru form" is on the list even though いる is
a subsidiary verb. This is only for the convenience of beginners whose first
language is English.)
CC BY-SA 4.0
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answer