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Token.sol

pragma solidity ^0.4.23;
contract Token {
    mapping(address => uint256) balances;
    uint256 totalSupply;

    function Token(uint256 _initialAmount) public {
        balances[msg.sender] = _initialAmount;
        totalSupply = _initialAmount;
    }

    function transfer(address _to, uint256 amount)
        public returns (bool) {
            require(balances[msg.sender] >= amount);
            balances[msg.sender] -= amount;
            balances[_to] += amount;
            return true;
        }
}

TokenFactory.sol

pragma solidity ^0.4.23;
import "./Token.sol";

contract TokenFactory {
    mapping(address => address[]) created;

    function createToken(uint256 _initialAmount)
        public returns(address) 
    {
        Token newToken = new Token(_initialAmount);
        created[msg.sender].push(address(newToken));
        newToken.transfer(msg.sender, _initialAmount);
        return address(newToken);
    }
}