The Sagittarius (Sgr) dwarf spheroidal galaxy and associated stellar streams provide valuable tools for the study of galaxy formation and evolution in the more massive surviving satellites of the MW as well as giving insights into the (dark) properties and assembly of the Galactic halo.  Using data from the Sloan Digital Sky Survey (SDSS), we construct accurate photometric colour-magnitude diagram (CMDs) and spectroscopic metallicity distribution functions of the different wraps of the Sagittarius stream. Through the accurate modelling of the CMDs, we determine the Star Formation History of the Sgr stream as a function of angle along the stream orbit and discuss the mix of stellar populations present in different wraps of the stream. This can be compared to the SFH of the Sgr core to determine when different parts of the stream were stripped from the host galaxy. Furthermore, from spectroscopic abundances of stars in the Sgr stream, we construct the metallicity and alpha-element distribution of Sagittarius. These can be directly compared to abundances in the Galactic halo and other LG dSphs, to explore the range of masses of dwarf galaxies that could have contributed to the formation of the MW stellar halo system.