Complex sentence: The Lithuanian delegation, after consultations in Kaunas on October 2, proposed their demarcation line on October 3, the Polish delegation, after consultations with Piłsudski, proposed a counterline of their own on October 4--the day League mediation began.
Split into simpler sentences: The Lithuanian delegation, after consultations in Kaunas on October 2, proposed their demarcation line on October 3. The Polish delegation, after consultations with Piłsudski, proposed a counterline of their own on October 4--the day League mediation began.