Simplify the following text for a Grade 12 native English-speaking person.
Original: The famed zeppelin Hindenburg that was destroyed by fire in 1937 was named in his honor , as was the Hindenburgdamm , a causeway joining the island of Sylt to mainland Schleswig-Holstein that was built during his time in office .
Simplified: The famous zeppelin Hindenburg that was destroyed by fire in 1937 had been named in his honor , as is the causeway joining the island of Sylt to mainland Schleswig-Holstein , the Hindenburgdamm , built during his time in office .