Complex sentence: A successful consulting electrical engineer Manville's ability attracted the attention of Dudley Docker (1862-1944), financial mastermind, who had already developed a prodigious range of business interests and delegated some of these interests to Manville.
Split into simpler sentences: A successful consulting electrical engineer, Manville's ability attracted the attention of financier Dudley Docker. Docker had developed a prodigious range of business interests and delegated some of these interests to Manville.