Complex sentence: The Trekkers opened in the early 1970s as a trekking centre, and operated as a private members club until 1984; thereafter it was run as a pub, housed in a log cabin until it closed in 2004.
Split into simpler sentences: The Trekkers opened in the early 1970s as a trekking centre. It operated as a private members club until 1984; thereafter it was run as a pub, housed in a log cabin until it closed in 2004.