Complex sentence: Although rarely, inland vagrants, generally caused by hurricanes or El Niño phenomenon, have been reported from the Colombian Andes; first recorded in July 2009 at the Interandean Valley, in northern Ecuador, where they remained for at least 161 days.
Split into simpler sentences: Although rarely, inland vagrants, generally caused by hurricanes or El Niño phenomenon, have been reported from the Colombian Andes. They were first recorded in July 2009 at the Interandean Valley where they remained for at least 161 days.