Though the time required for turtles to reach maturity is still uncertain, it is expected that 15-30 years or so after hatching the turtles that survive will find their way back to the same beaches to lay their own eggs.
(the time; required; ) (the turtles; survive; ) (turtles; to reach; maturity) (the time required; is; T:still; uncertain) (it; is expected; )
the time the turtles turtles the time required it
required survive to reach is is expected
maturity
T:still uncertain