The last time three eclipses (two solar and one lunar) happened in one month was back in December 1880.
(three eclipses; happened; T:in one month; T:The last time) (The last time three eclipses (two solar and one lunar) happened in one month; was; back in December 1880) (one month; was back in; December 1880)
three eclipses The last time three eclipses (two solar and one lunar) happened in one month one month
happened was was back in
T:in one month T:The last time
back in December 1880
December 1880