Complex sentence: The strong current from the river the prevented the Oda clan from effectively using its Arquebus and cannons the Oda charge itself was repulsed due to the current and inferior close quarter ability of the ashigaru making up the bulk of the Oda army.
Split into simpler sentences: The strong current from the river prevented the Oda clan from effectively using its Arquebus and cannons. The Oda charge itself was repulsed due to the current and inferior close quarter ability of the ashigaru making up the bulk of the Oda army.