Complex sentence: Elizabeth made frequent visits to the Danish royal court, and also to her former sister in law queen dowager Dorothea, and after her daughter became Queen of Denmark in 1572, her visits to Denmark became longer.
Split into simpler sentences: Elizabeth made frequent visits to the Danish royal court, and also to her former sister in law queen dowager Dorothea. After her daughter became Queen of Denmark in 1572, her visits to Denmark became longer.