How to combine ffmpeg vf commands for resizing and color correction?
Filter complex isn't needed. When a series of filters are to be applied to a single input in sequence, they are to be separated with a comma and passed along as a single filterchain (-vf, -af). You already did that with the setsar. So,

 ffmpeg -i input.m2t -vf "scale=852:480,setsar=1,eq=brightness=0.1:saturation=1.5" -crf 24 -c:a aac -b:a 48k -ac 1 -movflags +faststart output.mp4