Complex sentence: Suburban services were introduced on the Deeside line to Culter in 1894, after the line had been doubled, starting with ten down and nine up trains calling at seven stops in twenty-two minutes.
Split into simpler sentences: Suburban services were introduced on the Deeside line to Culter in 1894 after the line had been doubled. Initially ten down and nine up trains called at seven stops in twenty-two minutes.