ffmpeg command breakdown

ffmpeg -i 
D:/Users/suuser/Downloads/WritingtheProjectProposal.mp4 // input file
-i logo1920.png -i disclaimer1920.jpg -f lavfi -t 1 -i anullsrc -filter_complex "[2:v]fps=fps=
25 // fps
,loop=loop=
375 // duration*fps
:size=
25 // fps
:start=0[v2];[v2]fade=t=in:st=0:d=1,fade=t=out:st=14:d=1[vv2];[0:v]trim=start=
14 // trim start
:end=
2284 // trim start
,setpts=PTS-STARTPTS,scale=1920:1080[v0];[0:a]atrim=start=
14 // trim start
:end=
2284 // trim start
,asetpts=PTS-STARTPTS[a0];[v0][1:v]overlay=0:0[vv0];[vv0]fade=t=in:st=0:d=1,fade=t=out:st=
2269 // new video duration - 1
:d=1[vvv0];[a0]afade=t=in:st=0:d=1,afade=t=out:st=
2269 // new video duration - 1
:d=1[aa0];[vv2][3:a][vvv0][aa0]concat=n=2:v=1:a=1[vv][aa]" -map [vv] -map [aa] -c:a aac -vcodec libx264 -s 1920x1080 
D:/Users/suuser/Downloads/WritingtheProjectProposal.final.mp4 // output file