Complex sentence: The term "Great Britain" refers geographically to the island of Great Britain, or politically to England, Scotland and Wales in combination, however, it is sometimes used as a loose synonym for the United Kingdom as a whole (including Northern Ireland).
Split into simpler sentences: The term "Great Britain" refers geographically to the island of Great Britain, or politically to England, Scotland and Wales in combination. However, it is sometimes used as a loose synonym for the United Kingdom as a whole (including Northern Ireland).