Complex sentence: The most important textile building in Darwen is India Mill, built by Eccles Shorrock & Company but the company was ruined by the effects of the Lancashire Cotton Famine of the 1860s.
Split into simpler sentences: The most important textile building in Darwen is India Mill, built by Eccles Shorrock & Company. The company was ruined, however, by the effects of the Lancashire Cotton Famine of the 1860s.