Compound sentences have more than one independent clause. Complex sentences have dependent clauses. Compound-complex sentences have both. (simple) My dog ate my homework. (compound) My dog ate my...
The complex had many small shops and retailer stores. The way the human brain works is very complex. The compunds in the element were tested for Identification
I had an inferiority complex after everyone called me stupid every day. Simply, and inferiority complex means extremely low self esteem. So, you would use it in a sentence about very low self esteem.