Some eggs will be fixed at a certain point in their development, while others will be allowed to develop into tadpoles and adult frogs.
(Some eggs; will be fixed; T:at a certain point in their development) (others; will be allowed; ) (others; to develop; into tadpoles and adult frogs)
Some eggs others others
will be fixed will be allowed to develop
T:at a certain point in their development
into tadpoles and adult frogs