Complex sentence: Both parents are able to carry out all of the parental care tasks to a certain extent; however, because they are biparentally custodial, each sex will still focus on a specific set of behaviors in particular, which is susceptible to change during the brood cycle.
Split into simpler sentences: Both parents are able to carry out all of the parental care tasks to a certain extent. However, because they are biparentally custodial, each sex will still focus on a specific set of behaviors in particular, which is susceptible to change during the brood cycle.