We are living in an undeniably complex and difficult peiord in history.
We have to admit that the refugee problem is complex and difficult.
However, their data structure is complex and difficult to implement.
That is the only way to address such a complex and difficult issue.
Medical bills are becoming increasingly complex and difficult to read.
The compositions are complex and difficult for the public to understand.
The process is complex and difficult but the potential gains are enormous.
El proceso es complejo y difícil, pero los posibles beneficios son enormes.
The reality is that this is a rather complex and difficult issue.
La realidad es que se trata de un problema complejo y difícil.
It's a complex and difficult role, rich in nuances.
Es un papel complejo y difícil, muy rico en matices.
The current legislative process is highly complex and difficult to understand.
El proceso legislativo actual es muy complejo y difícil de comprender.
The process of illumination is very complex and difficult to understand.
El proceso de iluminación es muy complejo y difícil de entender.
This will be a complex and difficult task, but it is essential.
Se tratará de una tarea compleja y difícil, pero esencial.