Simplify the following text for a Grade 10 native English-speaking person.
Original: In 1927 , Baird transmitted a long-distance television signal over 438 m of telephone line between London and Glasgow ; Baird transmitted the world 's first long-distance television pictures to the Central Hotel at Glasgow Central Station .
Simplified: In 1927 , Baird made a signal go over 438 m between London and Glasgow ; Baird sent the world 's first long-distance television pictures to the Central Hotel at Glasgow Central Station .