Complex sentence: The junction was a double junction facing towards Cuddington but the line became single almost immediately and headed off in a south-westerly direction, turning gradually towards the south-east and climbing steadily for a mile before levelling off.
Split into simpler sentences: The junction was a double junction facing towards Cuddington but the line became single almost immediately and headed off in a south-westerly direction. The line then began to turn gradually towards the south-east and climbed steadily for a mile before levelling off.