Simplify the following text for a Grade 13 native English-speaking person.
Original: Transformation may also be used to describe the insertion of new genetic material into nonbacterial cells including animal and plant cells , however , because transformation has a special meaning in relation to animal cells indicating progression to a cancerous state , the term should be avoided for animal cells when describing introduction of exogenous genetic material .
Simplified: Transformation may also used to describe the insertion of new genetic material into nonbacterial cells including animal and plant cells .