Complex sentence: From the 1960s until the 1980s, the National Capital Region experienced a building boom, which was followed by large growth in the high-tech industry during the 1990s and 2000s.
Split into simpler sentences: From the 1960s until the 1980s, the National Capital Region experienced a building boom. This was followed by large growth in the high-tech industry during the 1990s and 2000s.