Complex sentence: As soon as the album was released, they make a quick visit home to NZ, did a whirlwind tour of Australian capital cities, and at the end of the month they boarded a boat for London.
Split into simpler sentences: As soon as the album was released, they make a quick visit home to NZ and undertook a whirlwind tour of Australian capital cities. At the end of the month they boarded a boat for London.