Complex sentence: A number of highly competent and experienced'crusties' (long standing members) led a number of very ambitious trips, up to two weeks in length, including one Olivines trip in which potatoes were carried until day 9.
Split into simpler sentences: A number of highly competent and experienced'crusties' (long standing members) led a number of very ambitious trips. These were up to two weeks in length, including one Olivines trip in which potatoes were carried until day 9.