After that event, the volcano has most obviously entered one of the longer periods of repose that is maybe to last much longer - up to several centuries - until a new eruptive cycle will begin with a major explosive eruption.
(the volcano; has most obviously entered; one of the longer periods of repose; to last much longer - up to several centuries - until a new eruptive cycle will begin with a major explosive eruption; T:After that event) (repose; is maybe; ) (a new eruptive cycle; will begin; with a major explosive eruption)
the volcano repose a new eruptive cycle
has most obviously entered is maybe will begin
one of the longer periods of repose to last much longer - up to several centuries - until a new eruptive cycle will begin with a major explosive eruption T:After that event
with a major explosive eruption