Complex sentence: An electric field is produced when the charge is stationary with respect to an observer measuring the properties of the charge, and a magnetic field as well as an electric field is produced when the charge moves, creating an electric current with respect to this observer.
Split into simpler sentences: An electric field is produced when the charge is stationary with respect to an observer measuring the properties of the charge. However a magnetic field as well as an electric field is produced when the charge moves, creating an electric current with respect to this observer.