Complex sentence: Through the 1950s, 1960s and 1970s ADG continued to expand through acquisitions (see below) and also in the 1970s created a new St. Petersburg, Florida-based department store, Robinson's of Florida.
Split into simpler sentences: Through the 1950s, 1960s and 1970s ADG continued to expand through acquisitions. In the 1970s, they created a new St. Petersburg, Florida-based department store, Robinson's of Florida.