Complex sentence: Throughout its existence, the railway invested in cross channel ferry services, initially from Shoreham to Dieppe, but following the opening of the line to Newhaven in 1847 the railway invested in the improvement of this harbour, building its own wharf, and dredging the channel.
Split into simpler sentences: Throughout its existence, the railway invested in cross-channel ferry services, initially from Shoreham to Dieppe. Following the opening of the line to Newhaven in 1847, the company improveed the harbour there, building its own wharf and dredging the channel.