Complex sentence: On the death of Hebblethwaite, Peter was joined by his brother James (1820-886), and they built an organ for the Yorkshire Exhibition of 1866 which was awarded a grand medal and then installed in St Peter's Church, Huddersfield.
Split into simpler sentences: On the death of Hebblethwaite, Peter was joined by his brother James (1820-886). They built an organ for the Yorkshire Exhibition of 1866; the instrument was awarded a grand medal and was installed in St Peter's Church, Huddersfield.