Which sentence is punctuated incorrectly ?

Which sentence is punctuated incorrectly?

1) He explained the principle of internal-combustion (although not very well.)

2) John Lennon (1940-1980) was a founding member of The Beatles.

3) The Latin expression "per se" ("in itself") has found wide use in legal circles.

4) Frederick (now known as "Tex") was becoming a well-known animator.