Complex sentence: As head of production at the label, Dre produced a large number of Ruthless projects, many of them high-selling; feeling the pressures of having to produce so many acts, Dre became frustrated with Ruthless.
Split into simpler sentences: As head of production at the label, Dre produced a large number of Ruthless projects, many of them high-selling. Feeling the pressures of having to produce so many acts, Dre became frustrated with Ruthless.