Simplify the following text for a Grade 8 native English-speaking person.
Original: Due to the extremely rugged , mountainous nature of Southeastern Alaska , almost all communities ( with the exception of Hyder , Skagway , and Haines ) have no road connections outside of their locale , so aircraft and boats are the major means of transport .
Simplified: Because of all the mountains , glaciers , and towns on islands in Southeastern Alaska , almost all the towns except Hyder , Skagway , and Haines have no roads that go to other places . Airplanes and boats are the major means of transport .