Complex sentence: Now both the Swarajists and the No-Changers were engaged in a fierce political struggle, but both were determined to avoid the disastrous experience of the 1907 split at Surat.
Split into simpler sentences: Now both the Swarajists and the No-Changers were engaged in fierce political struggle. But both were determined to avoid the disastrous experience of the 1907 split at Surat.