Complex sentence: Internal conversion is a radioactive decay process where an excited nucleus interacts electromagnetically with an electron in one of the lower atomic orbitals, causing the electron to be emitted (ejected) from the atom.
Split into simpler sentences: Internal conversion is a radioactive decay process wherein an excited nucleus interacts electromagnetically with an electrons in one of its lower atomic orbitals. This causes the electron to be emitted (ejected) from the atom.