Complex sentence: The more features implemented by the same feature in the host language, the less control the programmer of the interpreter has; a different behavior for dealing with number overflows cannot be realized if the arithmetic operations are delegated to corresponding operations in the host language.
Split into simpler sentences: The more features that are implemented by the same feature in the host language, the less control the programmer of the interpreter has. For example, a different behavior for dealing with number overflows cannot be realized if the arithmetic operations are just delegated to the corresponding operations in the host language.