Simplify the following text for a Grade 9 native English-speaking person.
Original: It often contains a DNA insert , which contains the gene sequence encoding a protein of interest , that has been subcloned into a vector , which contains bacterial resistance genes for growth in bacteria , and promoters for expression in the organism .
Simplified: It often contains a DNA insert , which contains the gene sequence encoding a protein of interest . The DNA insert has been subcloned into a molecular biology vector .