要留神，他不容易受騙。

Be careful. He's not an easy one to swindle.

Be on your guard. He's not an easy one to fool.

Source: Tatoeba

Sentence Composition

=1 要 yāo (bound form) to demand; to coerce
=1 要 yào
  1. to want; to need; to ask for
  2. will; shall; about to
  3. need to; should
  4. if (same as 要是 yàoshi)
  5. (bound form) important
=1 要 yǎo
  1. (archaic) alternative form of 偠 (yǎo)
  2. alternative form of 偠 (yǎo)
  3. used in 要褭／要袅
2 留神 liúshén
  1. to take care
  2. to be careful
3 他 tā
  1. (third-person singular) (since the early 20th century, usu. male) he; him; his
  2. (bound form) other; another; some other (as in 他日 tārì and 他人 tārén)
4 不容易 bùróngyì
  1. difficult; hard; troublesome
  2. having a hard time; having a tough time
5 受騙 shòupiàn
  1. to be cheated
  2. to be taken in
  3. to be hoodwinked