Simplify the following text for a Grade 10 native English-speaking person.
Original: The term is often used more broadly to include Elizabeth I 's reign ( 1558 - 1603 ) , although this is often treated separately as the Elizabethan era .
Simplified: The term can be used more broadly to include Elizabeth I 's reign ( 1558 - 1603 ) , although this is often treated separately as the Elizabethan era .