Complex sentence: During the 1950s and early 1960s BBC Birmingham and its associated region BBC Midlands, were based in offices and a small studio in Broad Street, Birmingham, however these became too small for the expanding region.
Split into simpler sentences: During the 1950s and early 1960s BBC Birmingham and its associated region BBC Midlands, were based in offices and a small studio in Broad Street, Birmingham. However, these became too small for the expanding region.