Some examples of objective complements would be the following:
Public speaking makes Henry nervous. (“Henry” = direct object; “nervous” = objective complement)
Boring movies make me sleepy. (“me” = direct object; “sleepy” = objective complement)
Jane painted her nails red. (“nails” = direct object; “red” = objective complement)
The students elected Gus secretary of the debate club. (“Gus” = direct object; “secretary” = objective complement)