Occasion/position sentences are topic sentences. They use a complex sentence structure and a preposition. You can think of an occasion/positions statement in two parts.
Examples
Although I have many friends, Bob is truly my best pal.
Even though I love the mountains, the coastal region is the best region in California.
If I were to choose my favorite teacher, I would definitely pick Mrs. Hunter.
When thinking about food chains, it’s clear that there are 3 main parts.
While I enjoy all the subject, math is my favorite.