Complex sentence: Her Maiden Voyage was the morning sailing to Liverpool on 30 June 1976, having already been several weeks late and missing the peak TT traffic, something which caused a lot of stress to the Steam Packet Company.
Split into simpler sentences: Her maiden voyage was the morning sailing to Liverpool on 30 June 1976. Already several weeks late, she had missed the peak TT traffic, something which caused much stress for the Steam Packet Company.