Simplify the following text for a Grade 5 native English-speaking person.
Original: The popularity of Radio 1 's touring summer live broadcasts the Radio 1 Roadshow - usually as part of the BBC ` Radio Weeks ' promotions that took Radio 1 , 2 and 4 shows on the road - drew some of the largest crowds of the decade .
Simplified: Radio 1 was the first legal radio station in Britain .