complex defect in a sentence

• The outlook is better even for the most complex defects.
• It is primarily used for reconstruction of complex defects where conventional techniques are not available ( in burn patients where common donor sites may have been damaged or destroyed ).
• For the few with more complex defects and those older individuals for whom surgery was not an option, a heart-lung transplant is the only alternative, but there are new drug treatments being developed which are showing promising results.
• It's difficult to see complex defect in a sentence .