Complex sentence: Here, on the site which Borchgrevink had described to the Congress, in the midst of a penguin colony, the first shore base on the Antarctic continent was set up, named "Camp Ridley" in honour of Borchgrevink's mother.
Split into simpler sentences: Here, on the site which Borchgrevink had described to the Congress, the expedition set up the first ever shore base on the Antarctic continent--in the midst of a penguin colony. It was named "Camp Ridley" in honour of Borchgrevink's mother.