Complex sentence: His interest in railways also includes model railways such as Gauge 1, he has a gauge 1 railway in his garden that was created in 1980, many years later a 10¼ railway was also built in his garden.
Split into simpler sentences: His interest in railways also includes model railways such as Gauge 1; he has a gauge 1 railway in his garden that was created in 1980. Many years later, a 10¼ railway was also built in his garden.