Hi!
Do you mean you created two _partitions_ ?
("sector" has a completely different meaning: the sector is the smallest unit we can read/write on a hard disk or SSD. Each devices may have thousands/millions of sectors). I suspect you mean two partitions - which then combined to a single one.
I can confirm that generally no, the amount of partitions do not cause any problems: do not cause higher temperatures and/or damages and/or lower health.
Generally the health decrease for an SSD is completely normal and expected behaviour: with usage (increased amount of written data) the health slowly decreases. This described at
https://www.hdsentinel.com/ssd_case_hea ... earout.php
I can confirm that the readings should be correct of course (assuming that the SSD has a working temperature sensor, but generally NVMe SSDs should have a working, correct sensor). These SSDs generally work and tolerate higher temperatures better: 60-70 Celsius is not surprising (even in idle, when there is no read/write activity) on such SSDs.
Some models provide warning/critical temperature values recommended by the manufacturer, if this is available, the Information page of Hard Disk Sentinel may display such values, exactly to help us both to know the actual temperature and the possible limits.
If you prefer to avoid possible overheat alert(s) or notifications, I'd recommend to open the Temperature page of this SSD and in the upper right corner, you can configure custom warning/alert thresholds by the Set custom temperature thresholds option, so until that, the temperature will shown as "green" for this SSD.
You may even have custom alerts for any devices to prevent too frequent alerts.
If you use Report menu -> Send test report to developer option, I can check the status (health, temperature and possible errors) of the SSD and advise.