Short answers, pulled from the story.
The limited goal of the British advance in Arakan in 1942 and 1943 was Akyab Island. This island held a port and all-weather airfield that was prominent in Allied plans to recover Burma.
The Japanese halted their advance on the Chindwin River because heavy monsoon rains made roads through the mountainous frontier impassable. This occurred in May 1942 when the Allies retreated from Burma.
Major General Wilfrid Lewis Lloyd commanded the 14th Indian Division as it began advancing south from Cox's Bazar near the frontier between India and Burma on the 17th of December 1942. He led the division until Lieutenant General Charles Broad dismissed him on the 29th of March 1943.
Miyawaki Force consisted of two battalions of the 213rd Regiment part of the Japanese 33rd Division plus a mountain artillery battalion under Colonel Kosuke Miyawaki. They occupied well-prepared positions that repeatedly repulsed British and Indian forces at Donbaik.
The 47th Indian Brigade was forced to retreat across the Mayu Range in small parties abandoning all equipment and ceasing to exist as a fighting force. This occurred after the main body of the Japanese 55th Division crossed the range on the 3rd of April 1943.