docs: revise README

README.md

@@ -2,35 +2,34 @@
 
 ## Overview
 
-This repository provides information with respect to timezones based on the IANA TZ database.
+This repository provides information for timezones based on the IANA TZ database.
 The information is available in a JSON file located at `gen/tzot.json`.
 
 
 ## What timezone is
 
 A timezone is a geographic region of the Earth that observes the same standard time, encompassing some timezone offsets.
 A timezone offset represents the difference between the local time in a specific timezone and the Coordinated Universal Time (UTC).
-In a timezone, timezone offset may transition to the another timezone offset by factors like daylight saving time adjustments or political changes in laws.
-The timezone offset transitions which are going to occur in the future can be scheduled by transition rules.
+In a timezone, transitions between timezone offsets may occur due to factors such as daylight saving time adjustments or political changes in laws.
+The timezone offset transitions that are going to occur in the future can be scheduled by several types of transition rules.
 
 The IANA Time Zone Database ( https://www.iana.org/time-zones ) is a comprehensive database used to manage timezones.
 
 
 ## What this repository provides
 
-This repository includes a program that parses the IANA Time Zone Database and extracts the information regarding timezones, each of which consists of timezone offset transitions and transition rules, as a JSON file to facilitate the handling of the information.
-That program is implemented using the `java.time` package in Kotlin.
+This repository includes a program that parses the IANA Time Zone Database and extracts the information regarding timezones, each of which consists of timezone offset transitions and transition rules.
+The extracted data is then formatted into a simply structured JSON file `gen/tzot.json`, specifically designed for handling the timezone offset transitions in various programming languages.
+That program is implemented in Kotlin using the `java.time` package.
 
 Additionally, this repository includes an automated mechanism for detecting updates to the database and overriding the `gen/tzot.json`.
 This mechanism is implemented as a GitHub Actions workflow which updates the `gen/tzot.json` monthly if a new version of the database is detected.
 
-The resulting `gen/tzot.json` is a simply structured JSON file, specifically designed for handling timezone offset transitions in various programming languages.
-
 
 ## Format of gen/tzot.json
 
 The format of the `gen/tzot.json` is a JSON value that can be assigned to a type `TzotJSON`.
-The definition of the type is available in `tzot.ts`.
+The definition of the type is available in `tzot.ts`, which specifies the structure of the JSON.
 
 The below shows an example of the JSON value.