Complex sentence: Between the third and fourth series, Bullen and Harries did a speaking tour in the Far East and Australia and as a result decided to work a trip to Sydney into the storyline of the fourth series because Australia was "a nice place to go".
Split into simpler sentences: Between the third and fourth series, Bullen and Harries did a speaking tour in the Far East and Australia. As a result, they decided to work a trip to Sydney into the storyline of the fourth series because Australia was "a nice place to go".