Be sure to cite
quotations correctly.
Use quotation marks to show where the
quotation begins and ends.
From article:
"Creating an overly complex system negates the purpose of the system itself."
PLAGIARISM/WRONG:
Creating a very complex system negates the purpose of the system.
CORRECT:
Creating a very "...complex system negates the purpose of the
system..." (author, date, page).
"Creating an overly complex system..." does not solve the
problem (author, date, page).
BETTER (use a paraphrase) :
Developing a system that is too complex does not solve the problem and makes the
system not useful (author, date, page).
Also see "avoiding plagiarism"