Complex sentence: The term safety bicycle was used in the 1880s for any alternative to the penny-farthing, later historians began to use the term in a more restricted way, for the design that was a direct ancestor to most modern bicycles.
Split into simpler sentences: The term safety bicycle was used in the 1880s for any alternative to the penny-farthing. Later historians began to use the term in a more restricted way, for the design that was a direct ancestor to most modern bicycles.