Complex sentence: After completing his apprenticeship, Grove was was admitted as a graduate of the Institution of Civil Engineers, in 1839 and a year later he went to Glasgow, gaining further experience in the factory of Robert Napier.
Split into simpler sentences: After completing his apprenticeship, Grove was was admitted as a graduate of the Institution of Civil Engineers, in 1839. A year later he went to Glasgow, gaining further experience in the factory of Robert Napier.