changes done by the mod increase in hp for all ranks
cheaper ability costs
increased rewards from missions and such
increased power from bonus and from reward
every story mission from base game resets your avatar progress
faster building off facilities and faster healing
insane reward increase from datapads
increased starting resources
reduced prices for recruitment of rookies
faster clearing of each row of rooms

all this is in the xcom game data file

xcomgamedata_characterstats 

increased hp and mobility where applicable

xcomgamedata_xpdata

reduced amount of kills needed to level up 

xcomlw__activities

changed income from havens

xcomlw_outposts

reduced detection chance of jobs

xcomlw_overhaul

increased reward from intel cache
increased bonuses from character gear