“变复杂”常见的英文表达有 become more complex、get more complicated 或 turn more intricate。以下为具体说明：
become more complex：这是最直接和常用的表达，强调事物从简单到复杂的转变过程。例如：The situation has become more complex since new factors were introduced.（自从引入新因素后，情况变得更复杂了。）
get more complicated：这个表达同样常用，语气稍显口语化，但意思与“become more complex”相近。例如：The problem seems to get more complicated as we dig deeper.（随着我们深入探究，问题似乎变得更复杂了。）
turn more intricate：这个表达稍显正式，强调事物结构的复杂性和精细性。例如：The design of the machine has turned more intricate with the addition of new features.（随着新功能的增加，机器的设计变得更复杂了。）