Complex sentence: High-rise construction was limited in the early part of the 20th century, but beginning in the 1970s, Hong Kong experienced a general trend of high-rise building construction that has continued to the present.
Split into simpler sentences: High-rise construction was limited in the early part of the 20th century. However, beginning in the 1970s, Hong Kong experienced a general trend of high-rise building construction that has continued to the present.