简简单单忘记自己麻麻烦烦想着过去
[jiăn jiăn dān dān wàng jì zì jĭ má má fán fán xiăng zhe guò qù]
It means "forget myself simply, yet thinking of the past complicates everything", suggesting a state of mind where one tries to keep life simple but gets entangled by thoughts of the past.