Complex sentence: The left branch goes to the inbound tracks from Shawmut Avenue/City Point and Tremont Street, the right branch to the outbound tracks to Shawmut Avenue/City Point (mid right) and Tremont Street (far right).
Split into simpler sentences: The left branch goes to the inbound tracks from Shawmut Avenue/City Point and Tremont Street. The right branch goes to the outbound tracks to Shawmut Avenue/City Point (mid right) and Tremont Street (far right).