Here are four shorter ways to say it for a 6-year-old:
- Snowdrops are the first flowers to appear when snow begins to melt.
- Snowdrops are the first flowers to come up as snow melts.
- Snowdrops are the first flowers to peek out when snow melts.
- Snowdrops are the first small flowers that show when snow melts.
Each sentence is 2–4 words shorter than the original.