This problem is too complicated to be explained in a few words.
这个问题千头万绪，三言两语说不清楚。
This is quite a complicated problem and one which is difficult to solve.
这是一个相当复杂的问题，这是一个难以解决的。
This is a rather complicated problem.
这是一个相当复杂的问题。
This is a comparatively complicated calculation problem.
这是一个较为复杂的计算问题。
This is a complicated optimization problem.
这是一个复杂的优化设计问题。
This is a complicated optimization problem.
这是一个复杂的优化设计问题。
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