низкого уровня сложности(receives assignments of a low complexity level with periodic review and evaluation by higher level staff – by Illinois Department of Central Management Services Tamerlane)
любой сложности(... while having sufficient resources and technical expertise through our physical locations to tackle projects of any level of complexity – CIMA Canada Inc.Tamerlane)
различного уровня сложности(... different types of instructional directive documents, of varying level of complexity and length ... – by Joel RheeTamerlane)