Used to state a general tendency or typical situation. More formal than たいてい or ふつう.
In many cases, my breakfast is bread and coffee.
In many cases, this illness heals naturally.
Means 'normally' or 'generally', implying a standard or expected state. 多くの場合 focuses on statistical frequency.
Compound of 多く (many) + の (possessive particle) + 場合 (case, situation). The phrase is transparent and follows regular Japanese grammar.