Complex sentence: The San Isidro rebels crossed the river to safety in Jaen, Nueva Ecija, Maunel Tinio, one of the major Novo-Ecijano commanders defended the rebels crossing the river, who were all relatives of the rebels there and were among his kinfolk.
Split into simpler sentences: The San Isidro rebels crossed the river to safety in Jaen, Nueva Ecija, Maunel Tinio. One of the major Novo-Ecijano commanders defended the rebels crossing the river, who were all relatives of the local rebels and were among his kinfolk.