Simplify the following text for a Grade 6 native English-speaking person.
Original: Lucca is a city and comune in Tuscany , central Italy , situated on the river Serchio in a fertile plain near the Tyrrhenian Sea .
Simplified: Lucca is a city in the Italian region of Tuscany . The city is located on the river Serchio in a very fertile plain near the Tyrrhenian Sea .