Simplify the following text for a Grade 10 native English-speaking person.
Original: The cathedral was extended with an eastern end in the 1960s , commemorated by Benjamin Britten 's Fanfare for St Edmundsbury , and a new Gothic revival cathedral tower was built as part of a millennium project running from 2000 to 2005 .
Simplified: The cathedral was extended with an eastern end in the 1960s , commemorated by Benjamin Britten 's Fanfare for St Edmundsbury . A new Gothic revival cathedral tower was built as part of a Millennium project running from 2000 to 2005 .