Complex sentence: On 4 April "U- 98" joined a wolfpack in an attack on Convoy SC 26, and sank the Norwegian 2,467 ton "Helle", and the British 5,122 ton "Wellcombe".
Split into simpler sentences: On 4 April "U- 98" joined a wolfpack in an attack on Convoy SC 26. She sank the Norwegian 2,467 ton "Helle", and the British 5,122 ton "Wellcombe".