This is the 16712th most frequent Russian word.
складывающиеся
"Folding" or "forming/composing," depending on context.
Here, 'складывающиеся' is used as a participle describing 'circumstances' that are forming or emerging.
В жизни иногда происходят складывающиеся обстоятельства.
In life, sometimes emerging circumstances arise.
In this sentence, 'складывающиеся' refers to 'factors' as those which are coming together or forming.
Складывающиеся факторы сильно влияют на решение.
Emerging factors greatly influence the decision.
The word 'складывающиеся' is used to describe 'relations' that are developing or taking shape.