《複雜》的詞曲創作背景源自於艾薇兒在成長過程中的各種心理反應。它包含了很多層意義，並將生活比作遊戲，探索人生的曲折複雜，因此也引用了不少游戲裡的術語和喻詞。以下是一段節選的歌詞：
Everybody's got their complicated
你我都有自己的故事
Their game and it's the same
不管玩的是什麼遊戲，那規則都是一樣
We could make it work if we wanted
我們想要堅持的話就能堅持
If we wanted to be something more than friends
但如果我們想要不只是朋友
And every broken every scar
每一次受傷每一次留下疤痕
You can see them all the way across the room
你都能從房間的另一頭看見那些傷痕
It's like a game that we can't win
就像我們無法贏得的遊戲
It's complicated and it doesn't make sense to me
它太複雜了，我不明白為什麼
以下是一段完整的歌詞：
And I know you're new to this
我知道你對這還沒習慣
But I can play the game too
但我也可以參與其中
Everybody's got their complicated
你你我我都有自己的故事
Trying to make it easier than it might have to be
努力使它變得比原本更容易些
Every scar and every bruise
每一次傷痕每一次青紫
It doesn't have to define you and me
它不一定要定義你我
We could find a way to win the game
我們可以找尋方法贏得遊戲
But I don't want my heart to get broken again
但我不想我的心再次破碎
以上是《複雜》的其中一段歌詞，完整的歌詞可以在艾薇兒的官方音樂平台上查找。