This is the 14226th most frequent Russian word.
осложняет
"Complicates"
Here, 'осложняет' describes how adverse weather conditions create difficulties for traveling.
Плохая погода осложняет путешествие.
Bad weather complicates the journey.
In this usage, 'осложняет' conveys the presence of a problem that increasingly adds difficulty to resolving the situation.
Проблема уже настолько осложняет ситуацию, что её трудно решить.
The problem complicates the situation so much that it is difficult to solve.
In this sentence, 'осложняет' is used to indicate an action by the task that makes the work harder or introduces complexities to it.