Complex sentence: The Toronto and Mimico Electric Railway and Light Company was incorporated in 1890 and was the operator of the Mimico line in the Toronto area that started operation in 1892 as a single-track, suburban streetcar line and became an radial line extending to Port Credit.
Split into simpler sentences: The Toronto and Mimico Electric Railway and Light Company was incorporated in 1890. It operated the Mimico line in the Toronto area starting operation in 1892 as a single-track, suburban streetcar line that later became a radial line extending to Port Credit.