Complex sentence: Initially, the port struggled to compete with the more established ports, for example in 1908 although Manchester had about 75% of the mule spindles in the UK only 14% of the raw material used in cotton spinning passed through the Port of Manchester.
Split into simpler sentences: Initially, the port struggled to compete with the more established ports. In 1908, although Manchester had about 75% of the mule spindles in the UK, only 14% of the raw material used in cotton spinning passed through the Port of Manchester.