Not hard to, Not difficult to, Easy to, Is obvious that
Structure
the most common variant:
想像 + (する) + に難くない
less common variants:
予想 + (する) + に難くない
察する + に難くない
理解 + (する) + に難くない
推測 + (する) + に難くない
(A) に難くない is a formal phrase that means taking situation/context into account it is “not hard” to imagine/guess or understand something. It is only used with a limited number of expressions, among which the most common is 想像. Less common than that are 予想、察する、理解 and 推測.