Step 1: Read the arrangement carefully.
'A' gives land to 'B' only for B's lifetime, and only afterward does it pass to 'C' completely, so ownership is being split across different time periods rather than between different people at once.
Step 2: Rule out the wrong categories.
This is not a legal-versus-equitable split, not a trust arrangement, and not co-ownership, since B and C never hold the property together at the same time.
Step 3: Name the correct concept.
Splitting ownership so that one person enjoys it now and another later is called fragmentation of ownership in respect of time.
\[ \boxed{\text{Fragmentation of ownership in respect of time}} \]